风心病二尖瓣狭窄，出现哪项体征提示心力衰竭

A．心尖部收缩期抬举性搏动 

B．交替脉 

C．拍击性第一心音 

D．肺动脉瓣区第二心音亢进 

E．短绌脉

What are the five hypotheses of the monitor theory