C
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, ttherefore, <b> winemakers who still use cork but wish to keep production costs from rising will be forced to reconsider plastic stoppers </b>. And since the wine-buying public' s association of plastic stoppers with poor-quality wine is weakening, <b> there is an excellent chance that the Bottlemaster plastic stopper will gain an increased share of the marked for wine-bottle stoppers </b>. 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 a conclusion drawn in order to support the main conclusion of the argument.
B: The first is the main conclusion of the argument; the second provides evidence in support of that main conclusion.
C: The first is a conclusion drawn in order to support the main conclusion of the argument; the second is that main conclusion.
D: 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.