Which of the Following Was a Central Argument of Keynes's

Multiple Choice

Which of the following was a central argument of Keynes's General Theory?  

A)  Competition does NOT allocate resources efficiently in a modern industrial economy. 
B)  Full employment can be maintained even during a major recession if wage rates are lowered far enough. 
C)  Modern industrial economies do NOT tend automatically toward full employment rates of output. 
D)  Government can best stabilize the economy by letting the market system automatically adjust toward full employment.