Mass of a body is always a quantity.

Options

A. Negative
B. Maybe positive or negative
C. Positive
D. Derived Quantity

Explanation

To solve the question "Mass of a body is always a quantity," we need to analyze the provided options regarding the nature of mass.

### Step-by-Step Solution:

1. **Understanding Mass**:
- Mass is a measure of the amount of matter in a body. It is a fundamental property of physical objects.

2. **Identifying the Options**:
- The options given are:
a) Negative quantity
b) Maybe positive or negative quantity
c) Positive quantity
d) Derived quantity

3. **Analyzing Each Option**:
- **Option a: Negative quantity**:
- This option is incorrect because mass cannot be negative. It is a measure of matter, and matter cannot exist in a negative form.

- **Option b: Maybe positive or negative quantity**:
- This option is also incorrect. Mass is always a definite quantity and cannot fluctuate between positive and negative values.

- **Option c: Positive quantity**:
- This option is correct. In physics, mass is always considered a positive quantity. For example, in Newton's law of gravitation, the force between two masses is always attractive, and both masses are treated as positive values.

- **Option d: Derived quantity**:
- This option is incorrect. Mass is a fundamental quantity, not derived from other quantities. It is one of the seven fundamental quantities in physics.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option c: Positive quantity**.

### Final Answer:
The mass of a body is always a positive quantity.

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