I'm confused about why answer choice B is the "primary purpose", rather than A?
As far as I can tell, the primary purpose is to explicate the nature of the "impasse" between objectivists and subjectivists. The closest thing to "advocating a possible solution" comes at the end with questions about what a solution would look like, but nothing is advocated. I see how A) "suggesting that there are valid aspects to both" is only part of the purpose, but it does seem a bit better to go with a partial answer like this, than one that is completely wrong, like B) no solution is proposed at all!
Thanks in advance for any hints on this one.