[語文] 請教OG 11th 紫-CR-70

[MBIJ (自以為是的人很多)]

請問一下這一題題目
我反覆看了好多遍
但還是不懂為何答案是這樣....

When people evade income taxes by not declaring taxable income, a vicious
cycle results.  Tax evasion forces lawmakers to raise income tax rates, which
causes the tax burden on non-evading taxpayers to become heavier. This,
in turn, encourages even more taxpayers to evade income taxes by hiding
taxable income.

The vicious cycle described above could "not" result unless which of the
following were true.

(A) An increase in tax rates tends to function as an incentive for taxpayers
to try to increase their pretax incomes.

(B) Some methods for detecting tax evaders, and thus recovering some tax
revenue lost through evasion, bring in more than they cost, but their success
rate varies from year to year.

(C) When lawmakers establish income tax rates in order to generate a certain
 level of revenue, they do not allow adequately for revenue that will be lost
through evasion.

(D) No one who routinely hides some taxable income can be induced by lowering
of tax rates to stop hiding such income unless fines for evaders are raised
at the some time.

(E) Taxpayers do not suffer from each other with respect to the rate of
taxation that will cause them to evade taxes.

正確答案是C

但是我不懂為何耶
有強者可以為我解答嗎?

感謝!!

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