I would go with B, I do not for sure know the answer but that is the one that seems to make the most sense
The belief that slavery is a morally offensive practice represents MORE kind of social norm.
Answer:
A
Explanation: the other three are either irrelevant or have already been answered in the text.
I think it would be To Whom It May Concern, because you don't know their relationship status (if that makes any sense)
I could be wrong though...
