In the following question, out of the four alternatives, select the alternative which will improve the underlined part of the sentence. In case no improvement is needed, select “No improvement”. As the world’s largest producer of hydroxychloroquine, India has recently not only exported the drug to SAARC countries and to its “extended neighbourhood” in the Gulf, but also to Russia, Brazil, Israel, and the U.S. ?

Option 2 : Exported the drug not only to SAARC countries

The correct answer is option 2 i.e. Exported the drug not only to SAARC countries.

First learn the usage of adverb "Only". It means no one and nothing more besides. Let's see some examples:

• Only I want to meet him once. (it means only I want to meet him no one else)
• I only want to meet him once. (It means only want and he demands nothing.)
• I want only to meet him once. (it means I just want to meet and do not want to do anything else)

In this sentence not only and but-also is a conjunction. If you look at carefully after but also countries are written. So in the same manner not only should be written. If after but also verb is used then in the manner after not only the verb should be placed or vice versa. or one has to follow the rule of parallelism. Let's see some examples:

1. They not only made a mistake but also told a lie. (after not only predicate is used and after but also predicate is used.)
2. Not only they but also we were present there. (after not only nominative case is used and after but also the nominative case is used)

So the correct sentence is:

As the world’s largest producer of hydroxychloroquine, India has recently exported the drug not only to SAARC countries and to its “extended neighbourhood” in the Gulf, but also to Russia, Brazil, Israel, and the U.S.