A proposed change to federal income tax laws would eliminate deductions from taxable income for donations ataxpayer has made to charitable and educational institutions. If this change were adopted, wealthy individualswould no longer be permitted such deductions. Therefore, many charitable and educational institutions wouldhave to reduce services, and some would have to close their doors.

The argument above assumes which of the following?

【选项】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.