Which of the following meal pairings exemplifies mutual supplementation that together provides a more complete amino acid profile?

• A. Two servings of the exact same whole grain bread without legumes or dairy, which only duplicates the same limiting amino acid profile
• B. A meal of isolated sugar and oil, which has negligible protein and therefore cannot provide complementary amino acids
• C. Brown rice with black beans (grains supply methionine; legumes supply lysine), eaten across the same day or meal
• D. A diet of only mixed nuts and seeds with no complementary grain or legume sources at any point, which may still be deficient in certain EAAs

Answer: (C)