So-Called Business Cycles Refer to the Multi-Year Periods

So-called business cycles refer to the multi-year periods:

A) From when new products are launched to the point when they become obsolete
B) Between the purchases of new capital equipment and the point when they become junk
C) From the origination of a business loan to the retirement or full repayment of the loan
D) During which the economy's overall output and employment expands and contracts