Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

Because of his ill health, the doctor has advised him not to refrain from smoking.

A to not refrain from

B to resort to

C to refrain from

D to be refrained from

E No correction required

ANS:C - to refrain from

No answer description is available.