Concept:In some plants, leaves are modified into fleshy, food-storing organs.
Explanation:Onion is a bulb, which contains a short underground stem surrounded by thick, fleshy scale leaves.
These scale leaves store water, sugars, and other food materials for the plant.
Ginger stores food in its rhizome, which is a modified stem, not modified leaves.
Pineapple and tomato do not have leaves specially modified for food storage.
Thus, among the given options, the onion is the plant whose leaves are modified for storing food.
Answer:B. Onion