I guess for weakning, strengthen, and flaw questions the explanation for eliminating and picking right answer should be similar. But I have a hard time for some other question types such as MBT, role, main conclusion because you could have variety of reasons to eliminate the wrong answers. I remember when I took the prep test class people had different reasons of why they didn't pick an answer or even picked the right answer.

I feel like some people eliminate because of something obvious and others eliminate because their really picky so they have variety of reasons why they eliminate an answer choice.

I think test writers usually put a few reasons in the wrong answers to eliminate it. Other times they make it for one very obvious reason.