Answer: A. Truman logically explains his reasoning for going to war.
In this excerpt, Truman is trying to gain support for the war in Korea. He does this by explaining the difficulties they have encountered, and the reasoning that has led them to make the choices they have made. His logical explanation and accurate description is meant to be persuasive. It forces people to place themselves in his shoes and try to understand the situation he finds himself in and the things he has achieved.