Topic: Right Form of Verb,

Best Answer Explained in Below-:

The correct answer to the question is C) "to refrain from." This is because the phrase "refrain from" is commonly used to indicate the act of deliberately avoiding or abstaining from an activity. In this context, the doctor is advising Sakib to stop smoking due to his ill health, making "to refrain from smoking" the appropriate and grammatically correct expression.

To analyze the other options:

A) "to refrain to" is incorrect because "refrain" is not used with "to." The correct preposition is "from."

B) "to be refrained from" implies that someone else would be preventing Sakib from smoking, which changes the intended meaning of personal advice to stop smoking.

D) "to not refrain from" contradicts the doctor’s advice. It suggests that Sakib should continue smoking, which is not the message being conveyed.

Overall, option C accurately captures the intended meaning of advising someone to avoid a particular behavior, making it the correct choice in this context.