Veterinarian: A disease of purebred racehorses that is caused by a genetic defect prevents afflicted horses from racing and can cause paralysis and death. Some horse breeders conclude that because the disease can have such serious consequences, horses with this defect should not be bred. But they are wrong because, in most cases, the severity of the disease can be controlled by diet and medication, and the defect also produces horses of extreme beauty that are in great demand in the horse show industry. The point of the veterinarian's response to the horse breeders is most accurately expressed by which one of the following? ['Racehorses that have the genetic defect need not be prevented from racing.', 'Racehorses that are severely afflicted with the disease have not been provided with the proper diet.', 'There should not be an absolute ban on breeding racehorses that have the genetic defect.', 'There should be no prohibition against breeding racehorses that have any disease that can be controlled by diet and exercise.']