The previous posts don't really clarify this question for me
(A) and (B) were just so, utterly similar to the stimulus. So here's my breakdown, hopefully it's somewhat viable:
Stim: [Subject] who has a [goal y] should do [action x]. If not, then there *will be* backlash that results in sabotaging / threatening [goal y], even though the "truth" is on the side of the [Subject.]
(A) [M-L managers] who have a [goal to ask companies to hire additional employees] should have [strong evidence]. If not, higher-level managers *will* refuse their suggestions [which is essentially discarding the M-L managers' goal], even though the "truth" is that hiring would actually benefit the company.
(B) [Politicians] who have a [goal to defend the rights of unpopular constituencies] should [use cool, dispassionate rhetoric]. If not, then the inflammatory rhetoric *can* cause more negative reasons to these constituencies [which threatens the politician's goal to defend their rights], even though the "truth" is that the politician's facts are straight. (Additional information: "whether or not these constituencies are deserving of more rights")
(A) fits nearly perfectly into this formula. There are two reasons for how (B) differs from the Stim:
1) DEGREE. "inflammatory rhetoric *can* cause a backlash." The Stim and (A) both say *will* with certainty
2) ADDITIONAL INFORMATION/CONCEPT. (B) touches upon both the idea of factual truth ("straight facts") and the idea of worthiness ("whether or not deserving of more rights"). (B) seems to suggest that even if his facts are straight, there is the possibility that these constituencies might not be more deserving of rights. The "facts" don't directly prove the politician is correct in his goal, and the "deserving of rights" is too vague/also does not vindicate him in his goal ("whether or not they are deserving" -- So are they deserving??).
If B said something like "Otherwise, inflammatory rhetoric
will cause more negative reactions against these constituencies,
even though they are deserving of more rights", I would think it would be a correct answer.