Correct the underlined part of the sentence from the options given below:

Rohini has taken the medicine for the last six months.

has been taking

The correct answer is Option (3) → has been taking

The sentence is in the present perfect tense, which is used to talk about actions that started in the past and continue to the present. The underlined verb "taken" should be in the present perfect participle form, which is "has been taking".

Here is the corrected sentence:

Rohini has been taking the medicine for the last six months.

This sentence means that Rohini started taking the medicine six months ago and continues to take it today.