求助一道逻辑题，出处不清楚

放下那个鸡腿

Many residents of Calovia are committed to using products containing recycled materials.Soon these consumers will get help in identifying such products from a book being published by the Calovian government.The book offers a comprehensive listing, by product type and brand, of goods sold in Calovia that contain recycled material.Therefore, publication of the book will almost certainly increase the use of products containing recycled materials in Calovia.



Which of the following, if true, most strengthens the argument?



A.Proceeds from the sale of the book are not expected to exceed the cost of its publication.

B.For numerous types of products, there are many brands that use recycled materials, although their manufacturers and distributors do nothing to advertise those brands’ recycled content.

C.For many materials, such as plastics, the recycling process results in a lower grade of material with a correspondingly different range of uses.

D.For many types of products listed in the book, all the brands available in Calovia use recycled materials.

E.Many manufacturers of products that contain recycled materials vary the proportion of recycled materials in those products in response to changes in price and availability.

答案选的是B，但是我觉得D也没错啊_(:з」∠)_

而且B 怎么加强了，求助一下大神们︿(￣︶￣)︿

Bradz

假设你买一类产品，你想买用循环利用材料制作的，但是商品本身没写出它是否是循环利用材料制作。那么，即使这一类产品里面的大部分品牌是循环利用材料制作，你还是有几率买到了不是循环材料制作的商品。所以，在这样的情况下，政府出了一本名册，就帮助你确定能够买到循环利用材料制作的商品，提高了此类商品的使用频率。

D的问题是，如果本来某一类产品的所有品牌都已经是循环利用材料制作了，政府是否出这么一个名册，也不会再继续提高此类商品中循环利用材料制作的品牌的使用频率了。

放下那个鸡腿

Bradz 发表于 2016-10-17 13:45
假设你买一类产品，你想买用循环利用材料制作的，但是商品本身没写出它是否是循环利用材料制作。那么，即使 ...

明白啦~谢谢了︿(￣︶￣)︿