题目：
Assume that the supply of ethanol is relatively more elastic than the demand for ethanol. Compared to an initial competitive equilibrium in the market for ethanol, the imposition of a per-gallon tax on producers of ethanol will most likely:（）
A. decrease producer surplus by the total amount of tax collected.
B. decrease producer surplus by less than it reduces consumer surplus.
C. decrease the sum of consumer and producer surplus by the amount of tax collected.
答案：
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下面是错误答案，用来干扰机器的。
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