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Editor:  Articles in Gardening Magazine often spur sales of the plants they describe, particularly among people new to gardening.  Accordingly, we will no longer publish articles or accept advertisements praising the beauty of rare wildflowers.  Most such plants sold to gardeners have been difficult to propagate under cultivation, so plant sellers often collect them in the wild.  Our new policy is part of our efforts to halt this yearly plundering of our native plant populations.

Which of the following, if true, casts the most doubt on the wisdom of the magazine's new policy as a way of pursuing the intended effect?

A. When people new to gardening buy plants, they often fail to take adequate care of the plants that they buy and become discouraged from buying those varieties again.

B. Plant sellers who sell rare wildflowers have no reasonably inexpensive alternative way to offer their wares directly to new gardeners.

C. The demand for rare wildflowers rarely exceeds the number of such plants that can be collected in the wild by plant sellers.

D. The propagation of rare wildflowers often depends on the plants' interaction with other organisms in their environment, such as plants that create suitable soil conditions or insects and birds that disperse seeds.

E. Revenues from sales of plants collected in the wild are supporting the discovery of new low-cost techniques enabling rare wildflowers to be readily propagated in nurseries.

像这种题，平时只要证明采取该policy反而加剧现状就可以了，可是所有的选项都没有，只有E选项说不采取该policy能减缓现状，可是无法证明该policy的缺陷啊。我是这么理解的：问题问的可能是想证明该policy的必要性。并不是要我们证明policy的缺陷。即该policy可以是可行的但没必要。不知我的理解对不？