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.

Most of the Indian workers are as healthy as, if not healthier than, British workers.

A.

as if healthy as not healthier

B.

healthier but not as healthy

C.

as healthy, if not healthier

D.

so healthy, if not healthier

E.

No correction required

Correct answer is E

No explanation has been provided for this answer.