(B) The people of the town were amused by their new loony's unusual appearance and seemed to take delight in his performance on the minibus.
This is the best summary of the ideas of the passage, because transforming into the loony and the experiences that follow are all collected in this statement.
Initially Valentine tells says that the two boys are opposites: Peter is a killer and Ender shows empathy. However, as the novel progresses, Ender is beginning to see himself as a killer rather than a sensitive boy who can show empathy.
Either D. Or A. I’m not completely sure but I’d say D.