Water molecules possess kinetic energy only.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that water molecules possess kinetic energy only. To analyze this, we need to define what kinetic energy is and how it relates to water molecules.

2. **Defining Kinetic Energy**: Kinetic energy is the energy that an object possesses due to its motion. In the case of water molecules, they are in constant motion, which means they do possess kinetic energy.

3. **Identifying Potential Energy**: However, the statement overlooks another important aspect: potential energy. Potential energy is the energy stored in an object due to its position or arrangement. In water, this is primarily due to the attractive forces between the molecules.

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