Which Othe Following Would Probably Be the Most Reliable Source

Which othe following would probably be the most reliable source otestimony in a speech about successful dieting strategies?

A) the CEO of Weight Watchers
B) a history professor from Princeton University
C) the head of Pfizer Pharmaceuticals' dietary supplements division
D) a scientist studying weight-loss methods at the U.S. National Institutes of Health
E) an infomercial for the NutriSystem weight loss program

Correct Answer:

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