________ is a kind of thermosetting plastic that is used for making electrical fittings.

Options

A. Teflon
B. Bakelite
C. Polyester
D. PVC

Answer

The answer to the question is "Bakelite."

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a type of thermosetting plastic used for making electrical fittings.

2. **Define Thermosetting Plastics**: Thermosetting plastics are polymers that become irreversibly hard when heated. They cannot be remolded or reheated after they have been set.

3. **Identify Common Thermosetting Plastics**: Some common examples of thermosetting plastics include Bakelite, epoxy resin, and melamine.

4. **Focus on Electrical Fittings**: Among these, Bakelite is specifically known for its excellent insulating properties, making it ideal for electrical fittings.

5. **Conclude with the Answer**: Therefore, the answer to the question is Bakelite.