求问GRE逻辑题

求问GRE逻辑题
A ten-year comparison between the United States and the Soviet Union in terms of crop yields per acre revealed that when only planted acreage is compared,Soviet yields are equal to 68 percent of United States yields.When total agricultural acreage(planted acreage plus fallow acreage)is compared,however,Soviet yield is 114 percent of United States yields.
From the information above,which of the following can be most reliably inferred about United States and Soviet agriculture during the ten-year period?
(A)A higher percentage of total agriculture acreage was fallow in the United States than in the Soviet Union.
(B)The United States had more fallow acreage than planted acreage.
(C)Fewer total acres of available agricultural land was fallow in the Soviet Union than in the United States.
(D)The Soviet Union had more planted acreage than fallow acreage.
(E)The Soviet Union produced a greater volume of crops than the United States produced.
请问第一句后半句的Soviet yields是指yields per acre还是总产量?C,D,E为何不对?Soviet的Fallow面积能与USA的Fallow面积直接做比较吗（不是比例）