Which of these conducts electricity ?

Options

A. plastic
B. Wood
C. Rubber
D. Safety pin

Explanation

To determine which materials conduct electricity, we need to understand the difference between conductors and insulators.

### Step-by-Step Solution:

1. **Identify the Materials**: The materials given in the question are plastic, wood, rubber, and safety pin.

2. **Understand Conductors and Insulators**:
- **Conductors**: These are materials that allow electric current to flow through them easily. Examples include metals like copper and aluminum.
- **Insulators**: These are materials that do not allow electric current to flow through them. Examples include plastic, wood, and rubber.

3. **Analyze Each Material**:
- **Plastic**: This is an insulator. It does not conduct electricity.
- **Wood**: This is also an insulator. It does not conduct electricity.
- **Rubber**: This is another insulator. It does not conduct electricity.
- **Safety Pin**: This is typically made of metal, which is a conductor. It can conduct electricity.

4. **Conclusion**: Among the materials listed, the safety pin is the only one that conducts electricity.

5. **Final Answer**: The correct answer is the safety pin.