Sentence A is complete, while sentence B is not. Complete sentence B, making it as similar as possible to sentence A.
Example: (A) No sooner had the match finished than it began to rain.
(B) Hardly ___________.

Hint: The given sentences all make use of correlative conjunctions. All you need to do is identify the partner of the given conjunction, and keep the meaning intact.

Complete answer:
In grammar, the conjunction is a part of speech that
connects words, phrases, or clauses that are called the conjuncts of the conjunctions.
Conjunctions have an important function because they join other words and phrases
together. Without conjunctions, we could only make very, very simple sentences. Some
conjunctions contain multiple words. They are called correlative conjunctions.
In the given sentence, the conjunctions should be split up and distributed, so that the
meaning of the sentence does not change at all.

In all the given sentences, there are two subject matters. So, we can conclude that we are looking for correlative conjunctions. One part of the correlative conjunction is ‘hardly’. the word ‘hardly’ is similar in meaning to ‘no sooner’. The partner of ‘hardly’ is ‘when’. They keep the meaning intact.

Similarly, there are two subject matters in the second set. So, we need correlative conjunctions. One part is ‘not only’, which suggests that there is one more thing. So, its partner can be concluded to be ‘but also’.
Now, we need to look at the placement. The two things in the sentence are ‘cricket’ and ‘football’. So, the first part ‘not only’ will be before ‘cricket’, as given in the question. And, the second part ‘but also’ will be in between the two things, so before ‘football’. The verbs will be changed accordingly. In order to figure out how the verbs change, you have to look at the given answer.

So, the correct answer will be written as follows:
Not only does Raju play cricket but also football.

Note:
Examine the given sentences carefully. Find a common thread and then, carefully identify which sentences have which conjunctions and then, make the necessary changes. Make sure that you do not change the meaning of the given sentences.