Two things to note here - the price is dropped, say earlier $1 each is now sold as $0.8 , so the reduced price is going to amp up sales. The analogy given here is peach marmalade has shown such trend and we expect the same to occur for radicchio. Option B provides the rationale behind why peach marmalade was able to show increased sales, because of 1 yr shelf life, if radicchio can show a significant shelf life, the purchase would increase. As lesser price, demand goes up, if the radicchio gets rotten easier, then sales wouldn’t go up. So conclusion fails. If on the contrary, the shelf life is higher, we can expect the sales to move up. Supporting the conclusion. Use negation for assumption question.