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The correct answer is "C". It refers to an entire universe of people "Americans" as well as the phrase "in excess" which includes many of the indulgences and "deregulations".These are presented as the element of the the main reasons for the "economic crisis" in an extended period of time (the 1920s). Any of the other options qualifies as correct simply because they provide supporting details.
The central idea of the text explains that Americans were indulging in excess and deregulation during the 1920s; thus, was unaware about this that it would contribute to an economic crisis.
During 1920s, the purchasing power of the people in America even the middle class increased. People started to spend unnecessarily by taking items on credit. Thus, the spread of capitalism and consumerism in the market lead to the crash of the stock market. Thus, it created the situation of the Great Depression.
The period was regarded as the roaring twenties where wealthy people got huge benefits from the economic system and overspending by people.
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