M-4-17. One state adds a 7 percent sales tax to the price of most products purchased within its jurisdiction. This tax, therefore, if viewed as tax on income, has the reverse effect of the federal income tax: the lower the income, the higher the annual percentage rate at which the income is taxed.
The conclusion above would be properly drawn if which of the following were assumed as a premise?
(A) The amount of money citizens spend on products subject to the state tax tends to be equal across income levels.
(B) The federal income tax favors citizens with high incomes, whereas the state sales tax favors citizens with low incomes.
(C) Citizens with low annual incomes can afford to pay a relatively higher percentage of their incomes in state sales tax, since their federal income tax is relatively low.
(D) The lower a state’s sales tax, the more it will tend to redistribute income from the more affluent citizens to the rest of society.（A）
(E) Citizens who fail to earn federally taxable income are also exempt from the state sales tax.
先是有阅读问题；the lower the income, the higher the annual percentage rate at which the income is taxed. 这个影响是the state sales tax 还是federal tax的？
请问答案D为什么错？
这题的逻辑关系，请大侠们给我仔细分析一下来龙去脉，可以吗？谢谢！
两个税把我搞晕了
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