Each of many different human hormones can by itself raise the concentration of glucose in the blood. The reason for this is probably a metabolic quirk of the brain. To see this, consider that althou most human cells can produce energy from fats and proteins, brain cells can use only glucose. Thus, if blood glucose level fall too low, brain cells will rapidly starve, leading to unconsciousness and death.
B. The reason that many different hormones can each independently raise blodd blucose levels is prabably a metabolic quirk fo the brain.
E. The reason brain cells starve if deprived of blucose is that they can produce energy only from glucose.
I chose E, the right answer is B. I think E is tied very tightly with "thus...", but B only pinpoints part of the premise, why B?
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