Glass, plastic, wood are example Insulator
They do not conduct electricity.
Insulator are used to protect us from the dangerous effect of electricity..
So Option ( A.) is Right =Insulator

Insulator

Glass, plastic, and wood are examples of insulators. Insulators are materials that do not easily allow the flow of heat or electricity through them. They have high resistance to the flow of heat or electric current.

Explanation:

1. Insulators prevent the flow of heat:
- Glass, plastic, and wood are poor conductors of heat. This means that they do not allow heat to pass through them easily.
- When you touch a glass, plastic, or wooden surface, it feels cooler than a metal surface because the insulating material does not conduct heat away from your body as quickly as a conductor, such as metal, would.
- Insulators are commonly used in the construction of buildings to prevent heat from escaping or entering. For example, double-glazed windows use a layer of insulating gas between two glass panes to reduce heat transfer.

2. Insulators prevent the flow of electricity:
- Insulators are also used to prevent the flow of electric current.
- Materials like glass, plastic, and wood have high resistivity, meaning they do not allow electric charges to flow through them easily.
- This property makes them suitable for insulation in electrical wires and cables. Insulating materials are used to cover the conductive wires, preventing electric shocks and short circuits.

3. Insulators in the context of this question:
- The question specifically mentions examples of glass, plastic, and wood as insulators.
- These materials are commonly used in everyday objects such as windows, bottles, furniture, and many other applications where the prevention of heat or electricity flow is desired.

In summary, glass, plastic, and wood are examples of insulators because they have high resistance to the flow of heat or electric current. They are commonly used in various applications where insulation is required to prevent heat transfer or electrical conduction.