Trainer: Research shows that when dogs are neutered in early puppyhood, their leg bones usually do not develop properly. Improper bone development leads in turn to problems with arthritis as dogs grow older. Thus, if you want to protect your dog from arthritis you should not neuter your dog until it is full-grown.

Question: Of the following, which one is a criticism to which the reasoning in the trainer's argument is most vulnerable?
Options:
A. It fails to state exactly what percentage of dogs neutered in early puppyhood experience improper bone development
B. It fails to explain the connection between improper bone development and arthritis
C. It overlooks the possibility that a new computer model is liable to malfunction for reasons other than a microprocessor flaw
D. It fails to consider the possibility that the benefits of neutering a dog early might outweigh the risk of arthritis
E. It fails to consider the possibility that dogs with properly developed bones can develop arthritis
Answer: "D"