Active Voice : - In the active voice, the sentence's subject performs the action on the action's target.

Passive Voice : - In the passive voice, the target of the action is the main focus, and the verb acts upon the subject.

The interrogative words when , why, where, how or what do not change their position at the beginning of the sentence when the active voice is changed into the passive voice. Note that Who changes to by whom and whom into who.

Rule used to identify that the sentence is in Passive Voice for interrogative sentence for interrogative words :

Interrogative Word + is / am / are + not + subject + third form of verb + by + object + ?

Example : By whom is not a bi-cycle needed?

Here,'by whom ' is the interrogative word ,'is' is the helping verb, use not , 'bicycle' is the subject ,'needed'  is the third form of the verb give ,'by' is used while replacing the subject into object in passive voices before the object by is used.  

Interrogative Word + is / am / are  + not + subject + third form of verb + object + ?

In the question : -

1. Who does not play chess?

The passive form of above sentence for interrogative sentence  is : -

By whom is not chess played? In this sentence , firstly use interrogative word Wh (by whom ) , then use helping verb is , then use not  then the subject (who)  is converted into object ( chess )  and then the objective part ( chess) , then third form of verb .

2. Who broke the glass?

The passive form of above sentence for interrogative sentence  is : -

By whom is the glass broken ? In this sentence , firstly use interrogative word Wh (by whom ) , then use helping verb is , then the subject (who )  is converted into object ( the glass ) and then third form of verb .

Thus , the Correct Option is B , which is 1. By whom is not chess played? 2. By whom is the glass broken?

Active Voice : - In the active voice, the sentence's subject performs the action on the action's target.

Passive Voice : - In the passive voice, the target of the action is the main focus, and the verb acts upon the subject.

Rule used to identify that the sentence is in Passive Voice for interrogative sentence for interrogative words :

Interrogative Word + was + subject + third form of verb + by + object + ?

Example: What was said by him? ( passive)

Here,'What' is the interrogative word ,'was' is the helping verb, 'he ' is the subject ,'said'  is the third form of the verb give ,'by' is used while replacing the subject into object in passive voices before the object by is used.  

While converting into Active Voice the rule will be :

Interrogative word + helping verb + subject + third form of verb + object ?

In the question : -

1. What did she buy?

The passive form of above sentence for interrogative sentence  is : -

What was bought by her? In this sentence , firstly use interrogative word Wh (what ) , then helping verb did is converted into was , then third form of verb ,  then use by preposition , then the subject (she )  . In objective part , she gets converted into her .

2. Where did he send that money order?

The passive form of above sentence for interrogative sentence  is : -

Where was that money order sent by him? In this sentence , firstly use interrogative word Wh (where ) , then helping verb did is converted into was , then the subject (he ) is converted into object (that money order) , then third form of verb ,  then use by preposition , then the object he . In objective part , he gets converted into him .

Thus , the Correct Option is C , which is 1. What was bought by her? 2. Where was that money order sent by him?

Active Voice : - In the active voice, the sentence's subject performs the action on the action's target.

Passive Voice : - In the passive voice, the target of the action is the main focus, and the verb acts upon the subject.

Rule used to identify that the sentence is in Passive Voice for interrogative sentence for interrogative words :

Interrogative Word + was/were + subject + third form of verb + by + object + ?

Example: Why were you punished by him? . ( passive)

Here,'Why' is the interrogative word ,'were' is the helping verb, ' he ' is the subject ,'punished'  is the third form of the verb give ,'by' is used while replacing the subject into object in passive voices before the object by is used.  

While converting into Active Voice the rule will be :

Interrogative word + helping verb + subject + third form of verb + object ?

In the question : -

Who wrote this book ?

By whom was this book written? In this sentence , firstly use interrogative word Who which gets changed into  by whom  and it is the subject also and subject (who) into is converted into object ( by whom ) , then was as helping verb , then the object (this book) , then third form of verb and at last end with question mark .

Thus , the Correct Option is D , which is By whom was this book written?