Answer:
B. The start of World War II
Step-by-step explanation:
World War II started only 10 years after, on the 1st of September 1939. when Hitler invaded Poland. After two days, he invaded France, after what Britain declared war on Germany. This was the official start of World War II.
All other events mentioned have happened in 1929. In October of 1929. there was a tremendous stock market crash known as Black Thursday. After that, the Great Depression started, causing recessions.