HELP! What mood does the author create in these sentences from " The Lady or the Tiger?"

When people gathered together on one of the great trial days, they never knew whether they were to witness a bloody slaughter or a hilarious wedding. . . . Thus the masses were entertained and pleased, and the thinking part of the community could bring no charge of the unfairness against this plan, for did not the accused person have the whole matter in his own hands?

a. humor

b. suspicion

c. disapproval

d. annoyance