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.
He found the gold coin as he cleans the floor.
A.
as he had cleaned
B.
while he cleans
C.
which he is cleaning
D.
while cleaning
E.
No correction required
Correct answer is D
No explanation has been provided for this answer.
