option (c) is the correct answer.
A country's overall economic activity may experience fluctuations of a certain kind called business cycles. A business cycle consists of expansions that approximately coincide with one another in a variety of economic activity, followed by declines that are similarly pervasive (recessions). This succession of changes occurs on a regular basis but not repeatedly. Business cycles are one example of economic cycles.
Business cycles are marked by the alternation of the phases of expansion and contraction in aggregate economic activity, and the condolement among economic variables in each phase of the cycle. The alternating phases of expansion and decrease in overall economic activity are what define business cycles.
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