Which list best reflects the variety of common dietary protein sources mentioned in the lesson?

• A. Only synthetic amino acid supplements and intravenous solutions, since whole foods do not provide useful proteins according to the lesson.
• B. Edible rocks and minerals because they contain trace amounts of nitrogen that are directly incorporated into human proteins.
• C. Meat, poultry, seafood, dairy, whole grains, legumes, nuts, and seeds.
• D. Sugary beverages, fruit juices, candy, and refined sugars as primary sources of dietary protein in most diets.

Answer: (C)