Question ID:PT43 S3 Q19 Passage:Today's farmers plant only a handful of different strains of a given crop. Crops lack the diversity that they had only a few generations ago. Hence, a disease that strikes only a few strains of crops, and that would have had only minor impact on the food supply in the past, would devastate it today. Stem:Which one of the following, if true, would most weaken the argument? Correct Answer Choice:BChoice A:In the past, crop diseases would often devastate food supplies throughout entire regions. Choice B:Affected crops can quickly be replaced from seed banks that store many strains of those crops. Choice C:Some of the less popular seed strains that were used in the past were more resistant to many diseases than are the strains popular today. Choice D:Humans today have more variety in their diets than in the past, but still rely heavily on cereal crops like rice and wheat. Choice E:Today's crops are much less vulnerable to damage from insects or encroachment by weeds than were crops of a few generations ago.