请教OG一道assumption题

darlingchum

195. Aproposedchangetofederal 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 proposedchange 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.

答案是A
但是为什么D是错的/

kelenrose

D说富人是唯一的向慈善和教育机构捐钱的个人。

原文的结论（因为消除收入税扣减项目所以富人不再会愿意捐款所以慈善和教育机构会减少服务或倒闭）发生并不能使这个D选项所说的事件必然发生。

可能个人捐赠只是慈善教育机构获得捐赠的很小一个部分，使得个人捐赠减少不会太严重地影响慈善教育机构运作呢。。。个人捐款者的构成和原文结论之间是否有什么关系题目并没有提到过。

我觉得哈！

sdcar2010

Because of the word "only."