Conjunctions: A conjunctions is a word used to join or connect words, groups of words, phrases, clauses or sentences.

Correlative Conjunction: They are conjunctions used in pairs. They are used for joining either words or sentences. They appear as pairs and are used to link equivalent sentences.

For Example :

Both ..........and                He is both rich and generous.

Either........or                    Either eat or place it in the fridge.

Neither ....... nor              He can neither read nor write.

Not only .........but also   He not only smokes but drinks also.

Though ..........yet           Though he is rich, yet he is not happy.

In the question :-

1. Last month, __________ did Vijay get the first position in class, __________ he won the 'Best Athlete' award. . In this sentence , not only  and but also is the correct correlative conjunction that can be placed in the blank part as it is used to show used to present two related pieces of information .

2. _______ that is the case, _______ I’m not surprised about what’s happening. . In this sentence ,If then is the correct correlative conjunction that can be placed in the .as it is used to show that "If" one thing happens, then another thing will happen.

Thus , the Correct Option is D , which is  Not only, but also , If , then .

Conjunction : A conjunction is a word or phrase that connects words, phrases, clauses, and sentences together.

Correlative Conjunction: They are conjunctions used in pairs. They are used for joining either words or sentences. They appear as pairs and are used to link equivalent  sentences. Correlative conjunctions create pairs of equal elements. By elements, we mean words and phrases within a sentence that are the same part of speech or serve the same function. This could mean two noun , two adjectives , two verbs , or two of the same kind of phrase .

For Example :

Correlative Conjunction: Both .......... and 

Usage:  He is both rich and generous.

In the question : -

1. I like mathematics very much . I like English as much equally . To join this sentence , we use correlative conjunction as well as as it is used to show an equal reason or an equally good result. .Then , sentence will be ,I love mathematics as well as English equally .

2. My present school is good . My earlier school is also good . To join this sentence , we use correlative conjunction both , and as it is used to  emphasize that something is true not just of one person, thing, or situation but also of another . Then , sentence will be , Both my present and earlier school is good.

Thus , the Correct Option is D , which is I love mathematics as well as English equally., Both my present and earlier school is good.

Conjunctions  A conjunction is a word or phrase that connects words, phrases, clauses, and sentences together. The word and is a commonly used example of a conjunction. Here are two examples of how we can use a conjunction like and in both a simple and complex way:

• The flower is yellow and white. (connects two adjectives)
• The flower is yellow, and it has a particular smell. (connects two sentences)

Conjunctions are useful in writing and speech to connect related ideas together, and they help us make our sentences shorter, less repetitive, or less confusing.

Correlative Conjunction: They are conjunctions used in pairs. They are used for joining either words or sentences. They appear as pairs and are used to link equivalent sentences.

For Example : - Though ..........yet . Though he is rich, yet he is not happy. Here , though and yet is used to connect equivalent sentences.

In the question : -

1. ________ had he gone out _______ it started raining. In this sentence , Hardly , when is the correct correlative conjunction that can be placed in the blank part as it is used to show that something is almost not true .

2. I do not care ____________ he attends the function _______ not. In this sentence , Whether , or  is the correct correlative conjunction that can be placed in the blank part as it is used to show a choice or doubt between two or more possibilities .

3. He is ______________ strong __________ brave . In this sentence , Not only , but also is the correct correlative conjunction that can be placed in the blank part as it is used for emphasizing the fact that there is something more to add .

Thus , the Correct Option is B , which is Hardly , when , Whether , or , Not only , but also .