Answer:It's B
Explanation: One of Montesquieu's key ideas was the creation of what? They are ways to make sure no one has too much power. What are checks and balances? He was an Enlightenment thinker who wrote The Social Contract which said that government is a contract between rulers and the people.
The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
B. The trenched soldiers feel victim to being stuck in their positions fruitlessly pushing back and forth
