A proposed change to federal income tax laws would eliminate deductions from taxable income for donations a taxpayer has made to charitable and educational institutions. If this change were adopted, wealthy individuals would no longer be permitted such deductions. Therefore, many charitable and educational institutions would have to reduce services, and some would have to close their doors. The argument above assumes which of the following?
(A) Without the incentives offered by federal income tax laws, at least some wealthy individuals would not donate as much money to charitable and educational institutions as they otherwise would have.
(B) Money contributed by individuals who make their donations because of provisions in the federal tax laws provides the only source of funding for many charitable and educational institutions.
(C) The primary reason for not adopting the proposed change in the federal income tax laws cited above is to protect wealthy individuals from having to pay higher taxes.
(D) Wealthy individuals who donate money to charitable and educational institutions are the only individuals who donate money to such institutions.
(E) Income tax laws should be changed to make donations to charitable and educational institutions the only permissible deductions from taxable income.
B是很好的混淆选项，B说那些由于政府税法优惠而捐款的人是慈善机构和教育机构的唯一经济来源。取非，还有其他的经济来源，就能weaken原文吗？其他的经济来源对于政府税法变化的态度文中并没有提啊，也许他们的反应会更激烈呢。
而A取非，那些有钱人不会因为不给税收优惠不少捐钱，恰好可以切合原文的内容，weaken。
不要加自己的理解进入题目
你认为B weaken的原因是主观认为 individuals who make their donations because of provisions won't donate if there is no deduction.
但这个原文并没有提及
B weaken 的 assumption 恰巧是A
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