Answer:
A. One of the main reasons the Great Depression began was that after the stock market crashed and the banks started to fail, people panicked and stopped spending money. When people stop buying items, fewer items are produced and unemployment rises, meaning even less consumption. This unfortunate spiral helped plunge the nation into depression.
Step-by-step explanation:
The above revision of the passage above maintains a formal style throughout. There is no fluctuation from informal to formal or vice versa. In the original passage, there was a switch from informal language to formal language. The use of the expression, "freaked out", is an informal language that should not be used in official and formal documents.
Also, the phrase, "buying less and less stuff" is also informal. The revision above maintains its formal tone throughout the text.