This figure compares corn yield (how much corn is produced) in relation to the area of land from which the corn was harvested, for the United States and globally. Which statement, according to this figure, is true? 
A) The efficiency of corn production (yield per area) in the United States has increased more than global efficiency.
B) The efficiency of global corn production (yield per area) has increased more than efficiency in the United States.
C) Global production efficiency was greater prior to 1980 than since 1980.
D) The efficiency of U.S. production has decreased.
Correct Answer:
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