求教NN们一道GWD逻辑题！。。

wxq19881113

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.

这个题选D，不太理解。。我选的A。。请问NN们。。用相关性做题，，到底是怎么做呢？具体怎么操作呢？？我逻辑不好，又要考试了，所以求教于NN们！！谢谢！！

wxq19881113

怎么没人理会？？！！！555~~~大家应该都做到过这个题的吧？？

wxq19881113

不要沉了！！自己up！