This is referring to the Great Depression(beginning). The reason the Great Depression happenned was due to overspeculation of industry after WWI. This lead to a large stock fallout after no more WWI materials(or not as many) were needed, leaving factories, businesses, and workers desolate. This lead to a stock drop on wall street in which millions of stockholders decided to pull their investments which further killed the American economy. Then, the federal reserve put more money(by printing cash) into circuit around the country. This caused large deflation which further hurt the economy, leading to the GB. Regardless, it is C.
Stay safe, have a good day. Give brainliest if this helps.
