Which of the following statements best describes a central idea of the text?

a
although the u. s. was victorious in the vietnam war, the american experience was long and painful.
b
the war was catastrophic for the vietnamese, and the u. s. failed in its mission to halt the spread of communism.
c
the american public did not know what was happening during the vietnam war, so people widely supported it.
d
the vietnam war had serious implications for the vietnamese people, though it remained popular with the american public.