A nurse is reinforcing dietary teaching with a client who is postoperative and adheres to a vegetarian diet. Which of the following foods should the nurse recommend to the client as containing the highest amount of protein?

A. Avocado: Avocados contain healthy fats and some protein, but the protein content is relatively low compared with legumes and other plant-based protein sources. They are more valuable for providing calories and essential fatty acids than protein. B. Bananas: Bananas are primarily a source of carbohydrates and contain minimal protein. They are useful for energy and potassium but do not significantly contribute to protein intake in a vegetarian diet. C. Tomato soup: Tomato soup is mostly water and carbohydrates with very little protein unless it is fortified or contains added legumes or dairy. It is not a reliable source of protein for postoperative nutrition. D. Black beans: Black beans are rich in plant-based protein, fiber, and essential nutrients. They provide a substantial amount of protein per serving, making them an excellent choice for a vegetarian client needing increased protein intake during postoperative recovery.