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.

The orator had been left the auditorium before the audience stood up.

A.

had been leaving

B.

was left

C.

had left

D.

would leave

E.

No correction required

Correct answer is C

No explanation has been provided for this answer.