In a World of Perfect Certainty,sharecropping Would Be Less Efficient

In a world of perfect certainty,sharecropping would be less efficient than a farm owner working his own farm because

A) sharecroppers receive only half of their marginal product.
B) paying a worker a wage gives him or her an incentive to shirk.
C) sharecroppers are exploited by landlords.
D) renting farmland concentrates risk on the renters.
E) all of the above.