[amp_mcq option1=”are” option2=”were being” option3=”have been” option4=”No improvement” correct=”option4″]
The correct answer is D. No improvement.
The sentence “After the discovery of the small pox vaccine, there is no cases of the disease in India” is grammatically correct and conveys the intended meaning. The verb “is” is used in the present tense to indicate that there are currently no cases of smallpox in India. This is consistent with the fact that smallpox was eradicated worldwide in 1980.
The other options are incorrect for the following reasons:
- Option A, “are,” is in the plural form, but the subject of the sentence is “no cases,” which is singular.
- Option B, “were being,” is in the past progressive tense, but the sentence is about a current state of affairs.
- Option C, “have been,” is in the present perfect tense, but the sentence does not indicate that the lack of cases of smallpox is a result of something that happened in the past.
Therefore, the correct answer is D. No improvement.