Corn Requires Large Amounts of Nitrogen Fertilizer

Corn requires large amounts of nitrogen fertilizer. As energy costs rise, so does the cost of nitrogen fertilizers and of corn. What is the major reason for this?

A) It costs more to transport the fertilizer.
B) It costs more to apply the fertilizer.
C) The Haber process requires a large input of energy.
D) More corn is now being used for the production of ethanol.
E) Corn is used for the production of high fructose corn syrup.

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