Introduction:
Coconut trees are known for their versatility and usefulness. Every part of the coconut tree has some purpose and is used in various ways. Let's explore each part and understand their significance.

A) Roots:
The roots of a coconut tree play a vital role in anchoring the tree firmly in the ground. They provide stability and support to the tree, especially during strong winds and storms. Additionally, the roots absorb water and nutrients from the soil, which are essential for the tree's growth and survival.

B) Stem:
The stem of a coconut tree, also known as the trunk, is another important part. It provides structural support to the tree and holds the leaves and fruits. The stem is long, sturdy, and fibrous, making it suitable for various purposes.

- Construction: The stem is used in construction activities. It can be cut into planks or beams to build houses, furniture, and boats.
- Firewood: The stem is an excellent source of firewood due to its high calorific value.
- Crafts: The stem is used to make handicrafts, including baskets, mats, and ropes.

C) Leaves:
The leaves of a coconut tree are large, long, and fan-shaped. They serve numerous purposes and are highly versatile.

- Shelter: The leaves are used to make roofs for huts and shelters. They provide protection from rain and sunlight.
- Handicrafts: The leaves are woven to create various products such as hats, baskets, and brooms.
- Packaging: The leaves are used to wrap food items, especially in traditional cooking methods.
- Fodder: Dried coconut leaves are used as fodder for livestock.

D) All of the above:
Every part of the coconut tree, including the roots, stem, and leaves, is useful and has its specific applications. The coconut tree is often referred to as the "tree of life" due to its multiple uses.

- Food: The coconut fruit itself is consumed as food, providing nourishment and hydration.
- Medicine: Various parts of the tree, such as the coconut oil, milk, and water, have medicinal properties and are used in traditional medicine.
- Cosmetics: Coconut oil is widely used in the production of cosmetics, including soaps, lotions, and hair care products.
- Agriculture: Coconut husks and shells are used as organic fertilizers and in gardening as a growing medium.

In conclusion, every part of the coconut tree, including the roots, stem, and leaves, is beneficial and finds its use in various aspects of human life. From construction to food, medicine, and handicrafts, the coconut tree's versatility makes it an invaluable resource.

D) All of the above