Select the correct active form of the given sentence.
By whom has this mischief been done?

Options

A. Who is doing this mischief?
B. Who has been doing this mischief?
C. Who has done this mischief?
D. Who did this mischief?

Explanation

Who has done this mischief? (Correct) (a) Who is doing t his mischief? (Tense has changed) (b) Who has been doing this mischief? (Tense has changed) (d) Who did this mischief? (Tense has changed)