A nurse is reinforcing teaching about nutritional needs of preschoolers with a group of parents. Which of the following foods should the nurse recommend as a source of complete protein?

A. Peanut butter is a good source of protein but is not a complete protein as it lacks some essential amino acids. B. Pinto beans are also a good source of protein but not a complete protein on their own. C. Eggs provide all the essential amino acids in adequate amounts, making them a complete protein. D. Broccoli is nutritious but not a significant source of protein and does not contain all essential amino acids.