______ is used as one of the raw materials for making soft soap.

Options

A. sodium carbonate
B. alcohol
C. potassium hydroxide
D. finely ground pumice stone

Explanation

To answer the question, "______ is used as one of the raw materials for making soft soap," we will analyze the provided options and determine which one is correct.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Sodium carbonate
- Alcohol
- Potassium hydroxide
- Finely ground pumice stone

2. **Understand the Process of Making Soft Soap**: Soft soap is typically made through a process called saponification. This process involves the reaction of fats or oils with a strong base.

3. **Determine the Role of Each Option**:
- **Sodium Carbonate**: While it can be used in some soap-making processes, it is not a primary ingredient for soft soap.
- **Alcohol**: This is not used as a raw material for making soap.
- **Potassium Hydroxide (KOH)**: This is a strong base that is commonly used in the saponification process to produce soft soap.
- **Finely Ground Pumice Stone**: This is typically used as an abrasive in cleaning products, not as a raw material for soap.

4. **Conclusion**: Based on the analysis, the correct answer is **Potassium Hydroxide**. It is the raw material used in the production of soft soap through the saponification process.

### Final Answer:
**Potassium Hydroxide**