business cycle

Economic indicator ABC is leading indicator that shows the economy has reached the peak of business cycle, the overall economy is most likely in the stage of…….
A. Peak 
B. Explasion
C. Contraction
D. Trough
老师您好， 这道题为什么不是C， 我的理解是has reached peak, 所以就选了C， 不知道是不是题意理解错误， 请老师解答。 谢谢