Critical Reasoning (CR) | Re: Advertisement: Do you want to be more energetic, vigorous, and physica

(C) At the beginning of the study, the volunteers’ reports on alertness showed levels on average no different from the average level reported by the National Institutes of Health.

(E) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers reported no increase in alertness or energy.

Between C and E

Option C only tells us that volunteers alertness levels were very similar to general
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