Read these sentences from "the piece of string":
"he went home indignant, choking with rage, with confusion, the more cast down since with his norman craftiness he was, perhaps, capable of having done what they accused him of and even of boasting of it as a good trick. . he felt himself struck to the heart by the injustice of the suspicion."

which word from these sentences contributes most to the mood of frustration and unfairness?

a. boasting b. suspicion c. capable d. craftiness