抱歉现在加粗了~~conclusion和main conclusion(GWD-24-Q24)

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GWD-24-Q 24:
Many winemakers use cork stoppers; but cork stoppers can leak, crumble, or become moldy, so that those winemakers must often discard a significant proportion of their inventory of bottled wine. Bottlemaster plastic stoppers, which cannot leak, crumble, or mold, have long been available to winemakers, at a price slightly higher than that of traditional cork stoppers. Cork prices, however, are expected to rise dramatically in the near future. Clearly, therefore, winemakers who still use cork but wish to keep production costs from rising will be forced to reconsider plastic stoppers. And since the wine-buying public’s association of plastic stoppers with poor-quality wine is weakening, there is an excellent chance that the Bottlemaster plastic stopper will gain an increased share of the marked for wine-bottle stoppers.

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

A.    The first is a judgment that has been advanced in support of a position that the argument opposes; the second is the main conclusion of the argument.
B.    The first is a judgment that has been advanced in support of a position that the argument opposes; the second is a conclusion drawn in order to support the main conclusion of the argument.
C.    The first is the main conclusion of the argument; the second provides evidence in support of that main conclusion.
D.    The first is the main conclusion of the argument; the second is a restatement of that main conclusion.
E.   The first is a conclusion drawn in order to support the main conclusion of the argument; the second is that main conclusion.
正确答案是E
做题的时候在DE之间犹豫了，虽然觉得D的restatement不好，但是题干中clearly,therefore后面的两个句子不是有and连接嘛,并列的话应该两个都是main conclusion呀，想请教下怎么分辨conclusion和main conclusion呢？

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抱歉抱歉啊~~