遇到一题逻辑题目 求分析选项

奋战750

Bio-chemists at Perck Pharma Corporation have discovered a new type of allergy. Their research confirms that it is not just caused by pollen of a certain flower, as it was thought. In addition, the flower has to be pollinated by a certain kind of bee to cause the allergy.Which of the following would most likely support the data's implication?

A. In the absence of the bee, the pollen does not cause allergic reactions.
B. The bee has been shown to be a critical element in the reproduction of the particular flower.  
C. Many cases of the allergy have been observed only in the presence of the bee.
D. In cases in which the allergy does not develop, the flower will grow without the presence of the bee.  
E. The onset of the allergy is usually caused by the flower even if the pollen is not present.

OA:A

在A/C之间徘徊了好久，最后选的C，求分析为什么C错。谢谢！

Source: https://www.manhattaneliteprep.com/blog/special-assumption-questions-gmat-prep/

奋战750

Investing in fishing-boats could be very profitable at this time. A survey made by "Hook, Line and Sinker" magazine shows that 75 percent of the magazine's readers want to buy a new fishing-boat during the summer. However, fishing-boat manufacturers can only produce enough boats to satisfy 30% of total potential buyers. Which of the following, if true, reveals a weakness in the evidence cited above?
A. The fishing-boat industry is a highly labor-intensive business.
B. Fishing-boats are not evenly distributed across the country.
C. The number of fishermen who buy fishing-boats has been growing each year for the past six years.
D. Readers of "Hook, Line and Sinker" magazine are more likely than other consumers to want a fishing-boat.
E. "Hook, Line and Sinker" magazine includes both articles about fishing and articles about building fishing-boats.

还有这一道题......
OA是D，但是怎么也看不出D为什么正确......

个人认为D：看杂志的人比其它消费者更想买boats。那我增加boats的生产的话，其它消费者还是会买啊，因为句中没说不想买啊，只说了相比看杂志的没有看杂志的那么想买，那这样的话，D不是没有起到削弱的作用？

跪求大神解答

ai559031

第一題
Ａ選項表示無因（ bee）無果（allergic）
但是Ｃ選項只有說many 並不是全部


第二題
30% of total potential buyers
全部潛在買家是指這個雜誌潛在買家＋其他買家
現在你只知道這個雜誌的所有人中75%想買船
但是如果實際上只有這個雜誌的讀者傾向買船, 其他雜誌讀者沒有
這樣不能說明整體想要買船的人很多, 所以投資會成功
所以就weaken了

TCSH

第一题c不是all
第二题c指出样本选择人群不能代表所有人