Which of the following is not true of U.S. agriculture?

Which of the following is not true of U.S. agriculture?

A.It is the most efficient in the world.

B.About a third of the world's food exports come from U.S. farms.

C.The use of modern farm machinery and agricultural methods has helped make U.S. farms the most efficient in the world.

D.The number of farms in the United States has increased since 1925.

正确答案是D