The rise and fall of economic activity through periods of expansion and recession is known as the .
A. business cycle
B percentage change
С. unemployment rate
D. consumer price index

The answer is A BUSINESS CYCLE, also known as the economic cycle or trade cycle, is the downward and upward movement of gross domestic product around its long-term growth trend. The length of a business cycle is the period of time containing a single boom and contraction in sequence.