Why is D wrong?

Hi @chelseaborg, Skylar has a detailed explanation of why (E) is right on another thread on this question posted by Ryan, but to summarize, E weakens the argument by presenting an alternative explanation for seed sale increases. If another large retail seed company goes out of business, the two largest seed companies would gain new sales from that as customers move from that now-defunct company to the big players. This doesn't, however, entail an increase in the number of people buying. (D) is incorrect because an economic downturn is out of the scope of the question. (D) itself does not claim that an economic downturn actually happened, and an economic downturn is not mentioned in the stimulus at all. Hope this helps.