Which of the phrases given below the sentence should replace the phrase printed in bold type to make it grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
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
Correct answer is C
No explanation has been provided for this answer.
