World War I veterans had been promised bonuses after the war but had to
wait for them. What did the veterans do to try to get the bonuses during the
Great Depression?
A. Hired lawyers to represent them
B. Marched on Washington, D.C.
C. Hired lobbyists to talk to legislators
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D. Wrote letters to Congress

The WWI veterans marched on Washington D.C.

Explanation:

In 1932 the WWI veterans organized a group of 43,000 demonstrators called the “Bonus Expeditionary Forces” (BEF) to march on Washington, DC, together with their families and affiliated groups to demand early cash redemption of their service certificates.

Isolationist is a form of the word isolationism which was the idea that america did not have to join WW2. The context clues in the statement that prove this are words like, "neutrality" and the phrase, "prevent involvement."

Explanation: