Concept:Foods from animal sources generally contain more protein than most plant-based foods. We compare the protein content per 100g of each food.Explanation:Cheese is a dairy product and a rich source of animal protein. Hard cheeses like Cheddar provide about 25g to 33g of protein per 100g. By comparison, mushroom contains about 3g of protein per 100g. Plantain provides only about 1.3g of protein per 100g. Yam provides about 1.5g of protein per 100g. Therefore, none of the plant-based options can match cheese in protein content.Answer:A. Cheese