Answer:
B.) The demands for goods in Europe decreased as populations in urban centers declined.
Step-by-step explanation:
The main effect of the plague was the population. Because it killed so many people, the population declined and the economy declined because of lack of demands for goods. Answer C is true, but that wasn't the answer they were looking for. A and D is illogical. So answer B is the better choice other than answer C because that was the main effect of the plague.