Select the correct passive form of the given sentence.She corrected fifty questions in one hour (a) Fifty questions have been corrected by her in one h our (b) Fifty questions were being corrected by her in one hour (c) Fifty questions were corrected by her in one hour (d) Fifty questions are corrected by her in one hour.

Options

A. Fifty questions have been corrected by her in one h our
B. Fifty questions were being corrected by her in one hour
C. Fifty questions were corrected by her in one hour
D. Fifty questions are corrected by her in one hour.

Explanation

(c) Fifty questions were corrected by her in one hour. (Correct) (a) Fifty questions have been corrected by her in one hour. (Tense has changed) (b) Fifty questions were being corrected by her in one hour. (Tense has changed) (d) Fifty questions are corrected by her in one hour. (Tense has changed)