一道逻辑题请教

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10. In order to pressure the government of Country S to become less repressive, some legislators in Country R want to ban all exports from R to S. Companies in R that manufacture telecommunication equipment such as telephones and fax machines have argued that exports of their products should be exempted from the ban, on the ground that it is impossible for a country to remain repressive when telecommunication equipment is widely available to the population of that country.

Which one of the following is an assumption on which the argument given by the manufacturers depends?

(A) The government of S has recently increased the amount of telecommunication equipment it allows to be imported into the country.

(B) The telecommunication equipment that would be imported into S if the exemption were to be granted would not be available solely to top development officials in S.

(C) A majority of the members of R’s legislature do not favor exempting telecommunication equipment from the ban on exports to Country S.

(D) Of all exports that could be sent to Country S, telecommunication equipment would be the most effective in helping citizens of S oppose that country’s repressive government.

(E) Without pressure from Country R, the government of S would be able to continue repressing its citizens indefinitely.

答案是B,请问为什么不是C? 多谢!

不好意思.我想问的是为什么不选D. 我认为B也是可行的．希望得到一个反对D的理由．请多指教．