PART A: Which of the following statements best identifies the central idea of this text?

A
Soldiers have forgotten most of their war memories in their old age.
B
Today, Vietnamese-American relations are relatively positive despite a history of conflict.
C
Although U.S.-Vietnamese relations are positive today, many Vietnamese people are still bitter and unable to move on.
D
Vietnam and the United States have been at war for so long that the reason is long forgotten.