What Is a Business Cycle

What is a business cycle?

A) It is a firm's pattern of sales during a given year.
B) It is the economy's pattern of fluctuations in economic activity: expansion followed by contraction and then by an expansion.
C) It is the pattern of fluctuations in consumer spending: increased spending during the summer months and holiday seasons and decreases at other times of the year.
D) It is the pattern of growth in gross domestic product over the long run.