(c) stands out to me as the most problematic to me. It is true that requiring real names reduces the amount of unwanted noise and can thus result in a higher q

(c) stands out to me as the most problematic to me. It is true that requiring real names reduces the amount of unwanted noise and can thus result in a higher quality discussion, but some people are just a lot more worried than others about their reputation with their peers. Lack of anonymity will cause you to second guess yourself a lot more before clicking the reply button.