Choose the correct statement.

Options

A. Strong nuclear forces are charge independent
B. Weak nuclear forces are charge independent
C. GravitaionaI forces are charge independent
D. All of these

Answer

To solve the question, we need to analyze each of the statements provided and determine their correctness regarding nuclear forces and gravitational forces.

### Step-by-Step Solution:

1. **Understanding Strong Nuclear Forces**:
- Strong nuclear forces are the forces that hold protons and neutrons (nucleons) together in the nucleus of an atom.
- These forces are indeed charge independent, meaning they do not depend on whether the nucleons are protons or neutrons.

**Hint**: Recall that strong nuclear forces operate at very short ranges and are responsible for binding nucleons together.

2. **Understanding Weak Nuclear Forces**:
- Weak nuclear forces are responsible for processes like beta decay in nuclear reactions.
- Similar to strong nuclear forces, weak nuclear forces are also charge independent. They can act on both protons and neutrons without being affected by their charge.

**Hint**: Consider the role of weak nuclear forces in particle interactions and decay processes.

3. **Understanding Gravitational Forces**:
- Gravitational forces act between masses and are described by Newton’s law of gravitation.
- These forces are also charge independent, as they depend solely on the mass of the objects and the distance between them, not on any electric charge.

**Hint**: Remember that gravitational force is always attractive and depends on mass, not charge.

4. **Evaluating the Statements**:
- Statement 1: Strong nuclear forces are charge independent. **True**
- Statement 2: Weak nuclear forces are charge independent. **True**
- Statement 3: Gravitational forces are charge independent. **True**

5. **Conclusion**:
- Since all three statements are true, the correct option is D: "All of these."

### Final Answer:
The correct statement is option D: All of these.