The key to getting this one right is noticing that the conclusion is that this startup will produce the "best" results.
So there is a comparison going on. This startup is being compared with other companies in the same industry, and the only difference we have been told about, the difference that will make the results different, the best, is the fact the the science managers are going to be paid twice the industry standard.
So that pay difference is reason that this company is expected to be different from others.
(A) This does not somehow strengthen the connection between double pay and producing the best results. For one thing, for all we know, the managers at the other companies are also top engineers.
(B) The easiest way to eliminate B, and this type of answer shows up in a lot of GMAT CR questions, is that B does not talk about something that makes this startup different from others. Right? The point it that this startup is different, and for all we know at all such startups' managers' bonuses are based on performance.
Meanwhile, what B says does not directly or specifically strengthen the idea that paying double will likely generate the best results.
(C) As is the case with A and B, this neither differentiates the company nor directly strengthens the relationship between double pay and producing the best results.
(D) This is clearly related to the connection between paying double and getting the best results. If the primary motivation of the best science managers were not pay but rather making a difference, then one might not attract the best managers, or produce the best results, by simply paying double. So what this says eliminates a potential issue, strengthening the conclusion that paying double will result in producing the best results.
(E) This is tempting, in that one might think that in order for the plan to work, this company has to be able to get managers to move to it from other companies. However, there are many ways to get employees, and for all we know the employees of companies like this one are generally hired right out of school or from universities or something. Meanwhile, if managers were not able to move from company to company, other companies would face the same challenge. So what this choice says does not change the relationship between double pay and best results and is not clearly important for making the plan work.
The correct answer is
.