C. to keep their children out of criminal activity
The clergy were the religious people of the Middle Ages. Following the pope, in order of rank, there were bishops, priests, monks and nuns. In the latter part of the Middle Ages, the pope, as head of the church, had much influence over the king and total control of the clergy.
First off, the Allies warned Japan TWICE about the bombings. Also the use of the two atomic bombs finally forced japan to surrender bringing an end to the war and brutal Japanese colonialism era in Korea, parts of China, Philippines, Indonesia and many more. (Japan committed many war crimes in these countries).
B. Other two don't make sense.