What is one problem about animal rights? (well, not problem, but here's an example: animal testing and hunting down animals.)

Animal abuse. 

Animals are being hurt because man think they are no good. Dog especially. Weather you're training her for dog fights or you're punishing her cause she did something bad, it's still abusing your pet. On TV I saw a pitbull was living in a swamp for a while. It was covered in maggots and it had gotten shot in the neck. Luckily, he lived. There was another episode and a pitbull was being used for illegal dog fights. She was covered in scars and bite marks.

People say pitbulls are vicious.

They bite you for a reason. Man do it for no reason. So you tell me, who's the vicious one? The dog or man?

That's just one example that I wanted to give you. 

Hope This Helps!!!

The answer is b. increased blood flow reduces nerve sensitivity