In Reference to Short-Term Economic Fluctuations, the "Trough" Refers To

In reference to short-term economic fluctuations, the "trough" refers to:

A) a period in which the economy is growing at a rate significantly below normal.
B) the high point of economic activity prior to a downturn.
C) the low point of economic activity prior to a recovery.
D) a particularly strong and protracted expansion.