Which of the following statements about ethanol is true?
A. Corn-based ethanol has a high energy returned on investment (EROI) value.
B. We can supply all of the automotive fuel used in the United States if we just double ethanol production.
C. We can easily grow enough corn ethanol and supply the world's food needs.
D. Growing corn for ethanol requires substantial inputs of fossil fuel energy.
Answer: D. Growing corn for ethanol requires substantial inputs of fossil fuel energy.
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