Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. Accordingly, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread. In the argument given, the two portions in boldface play which of the following roles?

Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. Accordingly, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.

In the argument given, the two portions in boldface play which of the following roles?

A、The first supplies a context for the argument; the second is the argument's main conclusion.
B、The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that, according to the argument, contributes to bringing about that outcome.
C、The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that tends to weigh against that prediction.
D、The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.
E、The first and the second each provide evidence to support the argument's main conclusion.

专业教师答疑

问题：請問金老師，這題我選了A檢討後確實覺得C比較好，但我是看第二個黑底字判斷的，因為第二個後面有however，所以後面才是結論，但是第一個黑體字A說他是context是不是也可以？然後B的第二個黑體字麻煩可以解釋一下錯在哪嗎？查看答疑

扫我提问哦！