求高手指点一道GMAT&LSAT CR的逻辑题：）

tian20111

Current farm policy is institutionalized penalization of consumers. It increases food prices for middle- and low-income families and costs the taxpayer billions of dollars a year.

Which of the following statements, if true, would provide support for the author’s claims above?

I. Farm subsidies amount to roughly $20 billion a year in federal payouts and $12 billion more in higher food prices.

II. According to a study by the Department of Agriculture, each $1 of benefits provided to farmers for ethanol production costs consumers and taxpayers $4.

III.The average full-time farmers have an average net worth of over $300,000.

(A) I only

(B) II only

(C) III only

(D) I and II only（D）

(E) I, II, and III
为什么 I会对啊？谢谢！

zhangsuyi

我的理解：

"Farm subsidies amount to roughly $20 billion a year in federal payouts "support "costs the taxpayer billions of dollars a year."

"$12 billion more in higher food prices"support "increases food prices for middle- and low-income families "

tian20111

明白了 谢谢啊~