Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

They felt humiliated because they realised that they had cheated.

A have been cheated

B had been cheated

C had been cheating

D were to be cheated

E No correction required

ANS:B - had been cheated

No answer description is available.