Definition: You are given a question on high school US history. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. The correct answer can be inferred from the information given in the question. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: This question refers to the following information.
"We found that not only was it a civil war, an effort by a people who had for years been seeking their liberation from any colonial influence whatsoever, but also we found that the Vietnamese whom we had enthusiastically molded after our own image were hard put to take up the fight against the threat we were supposedly saving them from.
"We found most people didn't even know the difference between communism and democracy. They only wanted to work in rice paddies without helicopters strafing them and bombs with napalm burning their villages and tearing their country apart. They wanted everything to do with the war, particularly with this foreign presence of the United States of America, to leave them alone in peace, and they practiced the art of survival by siding with whichever military force was present at a particular time, be it Viet Cong, North Vietnamese or American."
John Kerry, 1971
The most important factor in the defeat of Democratic presidential candidates in the elections of 1952 and 1968 was
(A)the American public's desire to avoid conflict and return to a more conservative political and social life (B)the Democratic Party platform pledge to increase taxes in order to pay off the national debt (C)the Democratic candidates' controversial positions on civil rights legislation (D)the Democratic Party's unequivocal support of the Equal Rights Amendment

A