From Ron神：try to diagram the argument, numbering each of the sentences and using the 'THEREFORE TEST' (try 'x, therefore y' and 'y, therefore x', and see which, if either, of them makes sense).

1 Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.
2 Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.
3 Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.
4 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.

the structure of this argument is:
1 = background fact
2, therefore 3
however, 4 (which weakens conclusion 3)

if you figure out that much, then it's clear that #3 is the CONCLUSION. (that's the single most important thing you can do on critical reasoning: figure out what's the conclusion.)

since neither of the boldface portions is the conclusion, choice a and choice d are dead. (both of those claim that the second part is the conclusion.)

now, analyze the boldface parts a little better:
#2 (the first boldface) serves as a premise for #3
#4 (the second bold) serves as a counterpoint to #3, weakening the lasting value of the conclusion
...which is basically what choice c says.

choice b is tempting, but you should note that the argument is specifically designed to point out that this 'state of affairs' CAN affect the outcome. choice e is nonsensical, as the two boldfaces are on completely opposite sides of the proverbial fence.

黑线划错地方了，麻烦改一下。
第一句：Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones
第二句：since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise

A选项错在哪里？development 这个词在本题中应该如何理解？

题目都错了，你们还分析的头头是道呢？？？

题目有问题哦，可以看一下这个说明，https://www.jianshu.com/p/a83b246fb03c
argument predicts will have a certain outcome 说的是第一句话而不是第二句...

这题答案绝壁错了

第一句：Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones
第二句：since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise
题有误

thus那一句是prediction，然后however转折反驳prediction

正确C，错选A

TAKEAWAY:BF题主要从两个方面判断，一是性质：fact/prem/con（前后性质判断是否准确）,二是方向+/- (前后是否同向)

hoice b is tempting, but you should note that the argument is specifically designed to point out that this 'state of affairs' CAN affect the outcome.

try to diagram the argument, numbering each of the sentences and using the 'THEREFORE TEST' (try 'x, therefore y' and 'y, therefore x', and see which, if either, of them makes sense).

affairs that the argument denies will be part of that outcome=the argument denies (that) affairs will be part of that outcome，否认某事；deny sth，拒绝接受，拒绝承认某物
重要的是后面的定语，而不是the first is xx, the second is xx.

划线貌似划错了？？？

The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.
第一个表明了预测会有certain outcome,即为seeds expensive, more water and fetilizer; 第二个承认了一个反驳预测的想法/考虑

按照这个加粗部分 C 选项是错的， 因为题干的prediction是这个种子 will become widespread. 第二个加粗部分没有against这个prediction

原题加粗部分是这里没有加粗的 :)

求详解

错选了choice B：
B) The first part is fine, but the second is not. The argument does not deny that the second boldface will be part of the outcome - rather, it says that the contrasting viewpoint is likely to overcome the main point of view.
choice B关于第二个黑体的描述是有问题的：原文逻辑并没有否认第二个黑体会发生，相反是支持第二个黑体有可能会发生

黑体1---thus。。。 however 黑体2 ，很明显however前后为opposite