单选题 All of the following statements concerning business cycles are correct except that

A、 a contraction generally follows a business peak.
B、 over long periods of time, the troughs generally occur at lower levels of Gross Domestic Product (GDP).
C、 a trough generally follows a contraction.
D、 real Gross Domestic Product (GDP) generally declines prior to a trough and increases thereafter.

【正确答案】 B

【答案解析】