Business cycles refer to the recurrent swings (up and down) in real GDP.
Economic downturns were seen by economists in both the United States and Europe as "diseases" that needed to be addressed; as a result, countries with a history of development and prosperity were considered to be "healthy" economies.
However, by the end of the 19th century, a large number of economists had come to understand that economies were cyclical by their very nature, and research was increasingly focused on identifying the primary factors that shaped the direction and disposition of national, regional, and industry-specific economies.
Economic experts, corporate leaders, and business owners point to a number of elements as being particularly crucial in determining the character of business settings today.
Hence, option C is correct.
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