Overhead cables need not be insu1ated because

Options

A. air is a bad conductor of electricity
B. air is a good conductor of electricity
C. bare wires conduct electricity better than. insulated wires
D. it is not economical to insulate them

Explanation

### Step-by-Step Solution:

1. **Understanding Overhead Cables**:
- Overhead cables are electrical wires that are suspended in the air, typically used for transmitting electricity over long distances.

2. **Types of Materials**:
- There are two main types of materials: conductors and insulators.
- **Conductors**: Materials that allow electricity to flow through them (e.g., copper, aluminum).
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