Clause : - A clause is a group of words that contains a subject and a verb that have a relationship. This relationship is crucial; a clause conveys information about what that subject is or is doing, rather than simply being a random grouping of words.

Adjective or Relative Clause Subordinate: An Adjective Clause is a group of words which contains a Subject and a predicate of its own, and does the work of an Adjective.

For Example: The umbrella with a broken handle is mine. [ Which umbrella ? ]

In the sentence the words, with a broken handle, describes the umbrella ; that is, it qualifies the noun umbrella, and does the work of an Adjective. It is what we call an Adjective phrase.

In the question : -

1. She told me the ___________ how her sister completed the work.

In this sentence , the correct clause used in the blank part is manner as it is used to show in which manner .

2. Has he told you the place ______________ the accident took place ?

In this sentence , the correct clause used in the blank part is where as it is used to show at which place .

Thus , the Correct Option is A , which is 1. Manner 2. Where .

Clause : - A clause is a group of words that contains a subject and a verb that have a relationship. This relationship is crucial; a clause conveys information about what that subject is or is doing, rather than simply being a random grouping of words.

Adjective or Relative Clause Subordinate: An Adjective Clause is a group of words which contains a Subject and a predicate of its own, and does the work of an Adjective.

For Example: The umbrella with a broken handle is mine. [ Which umbrella ? ]

In the sentence the words, with a broken handle, describes the umbrella ; that is, it qualifies the noun umbrella, and does the work of an Adjective. It is what we call an Adjective phrase.

In the question : -

1. I shall buy the same perfumed ____________ my friend bought.

In this sentence , the correct clause used in the blank part is that as it is used with a noun both in the case of qualification and resemblance.

2. Just do the same _____________ I do. 

In this sentence , the correct clause used in the blank part is as because it is used either without a noun or when the verb is unexpressed in the case of resemblance.                             

3. There is the mountain ____________ we are going to climb .

In this sentence , the correct clause used in the blank part is that connects the clause to the noun or pronoun it modifies. The relative pronoun shows the relationship between the clause and the antecedent.

Thus , the Correct Option is B , which is 1. That 2. As 3. That .

Clause : - A clause is a group of words that contains a subject and a verb that have a relationship. This relationship is crucial; a clause conveys information about what that subject is or is doing, rather than simply being a random grouping of words.

Adjective or Relative Clause Subordinate: An Adjective Clause is a group of words which contains a Subject and a predicate of its own, and does the work of an Adjective.

For Example: The umbrella with a broken handle is mine. [ Which umbrella ? ]

In the sentence the words, with a broken handle, describes the umbrella ; that is, it qualifies the noun umbrella, and does the work of an Adjective. It is what we call an Adjective phrase.

In the question : -

1. I like the same perfume __________ she.

In this sentence , the correct clause used in the blank part is as because it is used either without a noun or when the verb is unexpressed in the case of resemblance.

2. She is the same girl ____________ asked me for books yesterday.

In this sentence , the correct clause used in the blank part is that as it is used with a noun both in the case of qualification and resemblance.

3. She explained the reason ____________ she had to tell a lie. 

 In this sentence , the correct clause used in the blank part is why as it is used to show for which reason .

Thus , the Correct Option is C , which is As , That , Why .