Ais a short, fleshy stem surrounded by enlarged, fleshy bases of leaves.
bulb
tuber
stolon
corm

A bulb is a short, fleshy stem surrounded by enlarged, flesh bases of leaves. The most common bulb plants are bananas and onions where a flowering shoot is located at the center of the bulb ready for growth. They have a different way of storing their food source through extensions of the plants like shoots and flowers.

Apparently the correct answer is carbohydrates

Dthe lipid is most likely