Free energy is the one

Options

A. Present free in the body roaming here and there
B. Energy got from outside without any effort or cost
C. Energy available for doing work
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding Free Energy**:
- Free energy is a concept in thermodynamics that refers to the amount of energy in a system that is available to perform work.

2. **Definition of Free Energy**:
- It is defined as the energy of a thermodynamic system that can be converted into work at a constant temperature and pressure.

3. **Analyzing the Options**:
- The question provides multiple options regarding the definition of free energy. We need to evaluate each option to find the correct one.

4. **Evaluating Option A**:
- Option A states "present free energy in the body roaming here and there." This is incorrect because it does not accurately describe free energy.

5. **Evaluating Option B**:
- Option B states "energy got from outside without any effort or cost." This is also incorrect as free energy is not about energy received without effort.

6. **Evaluating Option C**:
- Option C states "energy available for doing work." This aligns perfectly with the definition of free energy, making it a strong candidate for the correct answer.

7. **Evaluating Option D**:
- Option D states "all of the above." Since options A and B are incorrect, this option is also incorrect.

8. **Conclusion**:
- Based on the evaluation, the correct answer is option C: "energy available for doing work."