Question

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

a. the CEO of Jenny Craig Weight Loss Centers

b. a psychology 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

Answer

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