In the following questions, in the given sentences, a part of the sentence is underlined. Beneath each sentence, four different ways of phrasing the underlined part are indicated. Choose the best alternative.

They felt humiliated because they realised that they had cheated.

A. had been cheating

B. had been cheated

C. have been cheated

D. were to be cheated

Please do not use chat terms. Example: avoid using "grt" instead of "great".