Which of the following in sewage treatment removes suspended solids?

Options

A. (a) Tertiary treatment
B. (b) Secondary treatment
C. (c) Primary treatment
D. (d) Sludge treatment

Explanation

To solve the question "Which of the following in sewage treatment removes suspended solids?", we can break down the sewage treatment process into its stages and identify where suspended solids are removed.

### Step-by-Step Solution:

1. **Understanding Sewage Treatment Stages**:
- Sewage treatment involves multiple stages: preliminary, primary, secondary, and tertiary treatment.

2. **Preliminary Treatment**:
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