Which of the following is conclusive proof that a supplement will enhance athletic performance?

Question

Answer

A peer-reviewed scientific article stating that athletes who took a supplement performed 10% better than athletes who took a placebo.

Answer

The fact that athletes need more nutrients, so a supplement source will enhance performance.

Answer

A survey of 500 athletes indicating that most top athletes are taking supplements.

Answer

Testimonials by several top athletes that they perform better with the supplement.

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