I really just thought so quickly that all of the rules made it necessary that someone be a member. So, the only way for Pat not to have to abide by the rules of the stimulus was to not be a member.

I always look at the question before starting the video and try to find an answer. I started with D and then switched to B. That was so much, and I don't even really understand how B is wrong, but I do understand why D is right.