15. The government should stop permitting tobacco companies to subtract advertising expenses from their revenues in calculating taxable income. Tobacco companies would then have to pay more taxes. As a consequence, they would raise the prices of their products and this price increase would raise the prices of their products and this price increase would discourage tobacco use.
Which of the following is an additional premise required by the argument above?
(A) Tobacco companies would not offset the payment of extra taxes by reducing costs in other areas.
(B) Tobacco companies would not continue to advertise if they were forced to pay higher taxes.
(C) People would not continue to buy tobacco products if these products were no longer advertised.
(D) The money the government would gain as a result of the increase in tobacco companies’ taxable income would be used to educate the public about the dangers of tobacco use.（A）
(E) The increase in taxes paid by tobacco companies would be equal to the additional income generated by raising prices.
本来选A的，结果多往下看了几行就选C了。
C为什么不对呢？C取非，不做广告也买烟，那厂家不就不打广告，不缴税了吗？整个推论的前提不就被推翻了吗?
请指教，多谢！ | 
