The answer is C. "to emphasize the pain and struggle that truth has lived through"
I would say C because its important you site what ever info your getting from the internet. Yes, the rest of the answers are to consider, but siting sources comes first.
Answer:
Many Americans opposed the war on moral grounds, appalled by the devastation and violence of the war. Others claimed the conflict was a war against Vietnamese independence, or an intervention in a foreign civil war; others opposed it because they felt it lacked clear objectives and appeared to be unwinnable