The correct answer would be D- conquest of Asia minor by Seljuk Turks<span />
Basically the reason why Vietnam won because the Vietnamese wanted to win more than the Americans did. There were a couple of reasons for this. First, the Americans were an invading force, and the Vietnamese were fighting on their own soil. Second, the Americans were not willing to make an all-out commitment to win.
False braided beard and royal gold and blue striped Nemes cloth.