@AudreyGilmour I struggled with this, too. I think you were right to highlight the word "either," which I think does imply exclusive or: "either A or B, but not both." In an exclusive or situation A -> /B.

With this in mind I think answer candidate A would be a fine choice if answer candidate E was not also an option.

I think A is logically very similar to the reasoning in the stimulus (and I think it's sound reasoning with an exclusive or), but it is certainly not MOST similar when compared to E.

I feel like when doing a shallow dip on B I need to consider the presence of the word "few" in the conclusion a match for the word "most" in the conclusion of the stimulus, because few presumably implies /most.

@giraffe0619 I had to look it up also. MP is Main Point. I agree that the abbreviations sometimes get in the way of comprehension.