求助一道GWD的逻辑题

T-9-Q2
Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants. If the tariff were lifted and unprocessed cashew were sold at world market prices, more farmers could profit by growing cashews. However, since all the processing plants are in urban areas, removing the tariff would seriously hamper the government‘s effort to reduce urban unemployment over the next five years.

Which of the following, if true, most seriously weakens the argument?

A. Some of the by-products of processing cashews are used for manufacturing plants and plastics
B. Other countries in which cashews are processed subsidize their processing plants
C. More people in kernland are engaged in farming cashews than in processing them
D. Buying unprocessed cashews at lower than world market prices enables cashew processors in kernland to sell processed nuts at competitive prices

E. A lack of profitable crops is driving an increasing number of small farmers in kernland off their land and into the cities

我看的答案是E 我怎么想也不觉得E是对的 我觉得五个答案搜不很好 我个人认为C是比较好的 所以我选的C

还请各位牛人指教

俺觉得~ 题目讨论的是关税和就业的问题，结论是说，降关税的话，会导致政府在城市失业方面作出的努力付之流水。或者说，不降关税，失业问题就不会变严重

E起到weaken: 农民种植的利润少了，他们就会离开土地去城里，这样还是会加重加城市的unemployment（因为不降关税，农民只好把自己的crop卖给 domestic processing plants，这样他们的利润没有那么多了，所以农村进城打工人口增加，失业问题就会变严重）

前天刚做的这套，我也选的是C

E 想简单点，就是农民进入城市，使的城市的就业率上升（因为 removing the tariff 对农民有利）

C 的说法是农民的就业好了，但是跟城市人就业怎么样无关