Question # 4 - Author's Main Purpose

Just wanted to receive some feedback as to why I think Answer Choices "A", "B", "C", and "D" are not the correct answer choice. Answer Choice A: the word "criticize" is too strong a word. Rather I believe the author describes inadequacies but never gives his input on those inadequacies. Answer Choice B: the author never contrasts two approaches. There's really only one approach discussed. Answer Choice C: an approach is spoken about but the author doesn't propose it himself. Answer Choice D: there is no support throughout the passage that the author is praising a solution. I believe this answer choice is simply too strong. Anyone's thoughts?