gmat In the year following an eight-cent increase in the federal tax on a pack of cigarettes,sales of cigarettes fell ten percent.In contrast,in the year prior to the tax increase,sales had fallen one percent.The volume of cigarette sales is therefor

gmat In the year following an eight-cent increase in the federal tax on a pack of cigarettes,sales of cigarettes fell ten percent.In contrast,in the year prior to the tax increase,sales had fallen one percent.The volume of cigarette sales is therefor
gmat
In the year following an eight-cent increase in the federal tax on a pack of cigarettes,sales of cigarettes fell ten percent.In contrast,in the year prior to the tax increase,sales had fallen one percent.The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.
The argument above requires which of following assumptions?
A.During the year following the tax increase,the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase.
B.The one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase.
C.The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
D.For the year following the tax increase,the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.
E.As the after-tax price of a pack of cigarettes rises,the pretax price also rises.
能想通是not+weaken削弱,只是不明白为什么b是错的.
我想法是 如果以前税提高

gmat In the year following an eight-cent increase in the federal tax on a pack of cigarettes,sales of cigarettes fell ten percent.In contrast,in the year prior to the tax increase,sales had fallen one percent.The volume of cigarette sales is therefor
这个是假设题,不是加强题啊
假设题取非之后原文结论必错
B只能加强,因为B取非的话,就是说The one percent fall in cigarette sales in the year prior to tax increase was NOT因为a smaller tax increase,就算因为其他原因,也不能使原文结论必错啊