which are classified as performance - enhancing drugs? select three options. vitamins protein powders…

Brief Explanations:

Performance - enhancing drugs are substances that improve athletic performance. Steroid precursors can be converted into steroids in the body to enhance performance. Anabolic steroids promote muscle growth and strength. Human growth hormone stimulates growth and can improve physical performance. Vitamins and protein powders are normal dietary supplements not typically considered performance - enhancing drugs in the same category.

Answer:

C. steroid precursors, D. anabolic steroids, E. human growth hormone