Chlorination, sedimentation, boiling, dumping,

Explanation

### Step-by-Step Solution:

1. **Identify the Options**: The options given are Chlorination, Sedimentation, Boiling, and Dumping.

2. **Understand Each Term**:
- **Chlorination**: This is a method of purifying water by adding chlorine to kill bacteria and other pathogens.
- **Sedimentation**: This is a process where water is allowed to sit undisturbed so that heavier particles settle at the bottom, clarifying the water.
- **Boiling**: This is another method of purifying water where water is heated to its boiling point to kill harmful microorganisms.
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