Which of these objects is made of thermosetting plastic?

Options

A. PET bottle
B. Garden hose
C. Polythene bag
D. Electrical switch

Explanation

To determine which object is made of thermosetting plastic, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understand Thermosetting Plastics**: Thermosetting plastics are materials that, once set into a given shape, cannot be remolded or reheated. They are typically used in applications where durability and heat resistance are important.

2. **Examine the Options**:
- **Option 1: PET Bottle**: PET (Polyethylene Terephthalate) is a type of thermoplastic. It can be melted and reshaped, so this is not a thermosetting plastic.
- **Option 2: Garden Hose**: Garden hoses are usually made from thermoplastics, which can also be reshaped when heated. Therefore, this option is not a thermosetting plastic.
- **Option 3: Polythene Bag**: Polythene (Polyethylene) is another thermoplastic. It can be melted and remolded, so this is not a thermosetting plastic.
- **Option 4: Electrical Switches**: Electrical switches are often made from thermosetting plastics. These materials provide good insulation and can withstand heat, making them suitable for electrical applications.

3. **Conclusion**: After analyzing all the options, the object made of thermosetting plastic is the **Electrical Switch**.

### Final Answer:
**Option 4: Electrical Switches** is made of thermosetting plastic.

---