D probably not quite sure
Answer:
The Truman Doctrine demonstrated that the United States would not return to ... both economically and militarily to contain the spread of communism around the world. ... One of the most pressing problems in the immediate aftermath of World War II ... in combatting the spread of communism: economic aid or military force?
Explanation:
The right choice is B. People voting in secret balloting for the candidates of their choice.
I would go with True because any historian needs a lot of patience to get what they want or to learn about something etc..