Answer:
D
Explanation:
1. Complementary proteins are two or more foods that together provide all nine essential amino acids that the body cannot produce on its own.
2. Peanut butter on whole wheat bread: Peanut butter is rich in lysine but lacks methionine, while whole wheat bread is high in methionine but low in lysine. Together, they form a complete protein with all essential amino acids.
3. Whole wheat pasta with tomato sauce: Whole wheat pasta is high in lysine but lacks tryptophan, which can be found in tomato sauce. When combined, they create a complete protein.
4. Brown rice and potatoes: Brown rice is low in lysine but rich in methionine, while potatoes are low in methionine but contain lysine. Together, they complement each other to provide all essential amino acids.
5. Therefore, all of the food combinations listed in the options supply high-quality protein because they contain complementary amino acids, ensuring the body receives all the necessary building blocks for protein synthesis.