The answer is D
Hope this helps :D
You don't show options, so here are the different definitions
1. "the study of past events, particularly in human affairs."
2. "the whole series of past events connected with someone or something."
3. "a continuous, typically chronological, record of important or public events or of a particular trend or institution."
Answer:
He took protectionist measures
Explanation:
Hoover was nicknamed "do nothing" by the Democrats, it is not true that he did not try to solve the crisis but he definitely failed to solve it. He defended the Smoot-Hawley tariff which made the situation much worse.