Answer:
D. The U.S did not want Vietnam to be ruled by the French
Explanation:
A is true due to the "Red Scare" if communism spreading across the world
B is true since the U.S were not in good terms with the USSR, and the fight against communism was prevalent in Soviet Controlled countries
C is true, some research done today has found evidence to suspect that the U.S government misinterpreted the information to justify a war against Vietnam (this is why the question says "allegedly")
