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.
to not refrain from
to resort to
to refrain from
to be refrained from
No correction required
Correct answer is C
No explanation has been provided for this answer.