GMAT Verbal Reasoning Practice Test 2

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 $\mathrm{\$}20$ billion a year in federal payouts and $\mathrm{\$}12$ billion more in higher food prices.
II. According to a study by the Department of Agriculture, each $\mathrm{\$}1$ of benefits provided to farmers for ethanol production costs consumers and taxpayers $\mathrm{\$}4$
III. The average full-time farmers have an average net worth of over $\mathrm{\$}300,000$