Answer:
(A) it is answer cause i said it is answer
I think it was D. Basically the US sent South Vietnam troops because they feared Vietnam would become communist, which would spread to the rest of Asia. The US sent supply and materials to South Vietnam to help the spread. I don't know if the answer that best suits that is D, but that's what I would say.
If I'm right, I believe that it is the "KKK", or Ku Klux Klan. They were white men that dressed up in white robe-like uniforms that tortured African Americans simply because of their race being different from their own.
The correct answer is - they were forced to come as enslaved people.
This was the time when slavery in America took place - Americans would go to Africa, take the slaves against their will, and transport them to America where they would have to work for free and do extremely difficult jobs just because of their skin color.