I would say that the answer is A. It seems like the best choice.
Answer:
1. Because the author wants to enhance unity in the society
2.when you work together, you will be strong.
But if you seperate ways your enemies may break you
Answer: A. Someone's child had joined the military
Explanation: The "flag" is a great symbol of the military so it's a hard trick question, assuming that he is grown up by then by the lines "But his country called him man-size." Therefore he is still looked at as a kid they cared for which are his/hers parents.