I need help understanding why the correct answer choice (A) is correct for this question. I understand that all the other answer choices are terrible (leaving A as the only answer choice), but I still feel like A is too strongly stated to be a necessary assumption for the argument.
In my thinking, a necessary assumption for the argument is that the econ explanation and psychological explanation are mutually exclusive from each other. Answer choice A seems to go way beyond this and say that the econ explanation is excludes all other explanations (not just the psychological one).
What's wrong with my thought process? Thanks!
Thanks for your detailed response! This is helpful, especially the parallel argument.