In mammals it is the secondary palate that permits breathing while eat

Can someone explain how to arrive at the correct answer to this question?
My understanding
Argument:
Premise: In mammals there is a secondary palate that helps with breathing while eating.
Conclusion : Breathing while eating is necessary to maintain the high rate of metabolism in mammals.
Possible weakener(pre-phrasing): Since breathing is the necessary condition, if we could prove a in a species it will not result in maintaining necessary metabolism rate we should be good

Option A - Supports the argument.
Option B - Similar to pre-phrasing. So keeping it!
Option C - Not relevant or not necessarily weakening.
Option D - No secondary palate but still a high rate of metabolism. This indicates that breathing while eating is not necessary for maintaining high metabolism rate. Hence possibly weakens it. Keep this !
Option E - Similar to B
Now among B, D, and E - D and E are talking about secondary palate(which I feel is in the premise) and not about breathing directly(This is in the conclusion). Hence I rejected these two and went with B.
Am I wrong in my reasoning here ? Another point here is both B and E indicate the same(atleast logically) and hence should have gone with D.