Since a very beginning, US only had a tough attitude: the world had to give explanations to the Americans and Vietnam was a country with a very deep principles, one of them was the respect for the older men as a bridge between the real world and his gods, While US despite old men as an "unproductive ones".
Share the word and never let it die.
Answer:
A
Explanation:
Seems like the most acceptable option.
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B- The Manhattan project was a top secret project carried out by the U.S government to create an atomic bomb.