Which of the following does not lead to water pollution?

Options

A. The addition of undesirable substances to water bodies.
B. The removal of desirable substances from water bodies.
C. A change in pressure of the water bodies.
D. A change in temperature of the water bodies.

Explanation

To determine which of the following does not lead to water pollution, let's analyze each option step by step:

**Step 1: Understand the concept of water pollution.**
Water pollution occurs when harmful substances contaminate water bodies, leading to adverse effects on the environment and living organisms.

**Step 2: Analyze the first option.**
- **First option: The addition of undesirable substances to water bodies.**
This option clearly leads to water pollution as adding harmful substances (like chemicals, plastics, or detergents) contaminates the water.

**Step 3: Analyze the second option.**
- **Second option: Removal of desirable substances from the water body.**
Removing essential substances (like oxygen or nutrients) from water can disrupt the ecosystem and lead to pollution, as it affects the health of aquatic life.

**Step 4: Analyze the third option.**
- **Third option: A change in temperature of water bodies.**
This option can be tricky. While temperature changes can affect aquatic life, they do not directly introduce pollutants. However, significant temperature changes can lead to conditions that may promote pollution (like algal blooms), but the change itself is not a pollutant.

**Step 5: Analyze the fourth option.**
- **Fourth option: A change in the temperature of the water bodies.**
This option is similar to the third one. While temperature changes can have ecological impacts, they do not directly lead to the introduction of pollutants.

**Conclusion:**
Based on the analysis, the option that does not lead to water pollution is:
- **A change in temperature of water bodies.**