Assertion (A): Nuclear force is same between neutron-neutron, proton-proton and neutron-proton.
Reason (R): Nuclear force is charge independent.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Explanation

To analyze the statements provided in the question, we will break down the assertion and reason step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "Nuclear force is the same between neutron-neutron, proton-proton, and neutron-proton."
- The nuclear force, also known as the strong force, acts between nucleons (protons and neutrons) in the nucleus of an atom. It is indeed a short-range force that acts effectively at distances on the order of 1 femtometer (10^-15 m).
- The nuclear force is attractive and is responsible for holding the nucleus together, regardless of whether the interacting particles are protons or neutrons.

2. **Understanding the Reason (R)**:
- The reason states that "Nuclear force is charge independent."
- This means that the nuclear force does not depend on the electric charge of the particles involved. Protons are positively charged, while neutrons are neutral. Despite this difference in charge, the nuclear force acts similarly between all pairs of nucleons (neutron-neutron, proton-proton, and neutron-proton).
- The nuclear force is primarily dependent on the strong interaction between the particles, which is not influenced by their electric charge.

3. **Evaluating the Truth of the Statements**:
- Both the assertion (A) and the reason (R) are true.
- The assertion is correct because the nuclear force is indeed the same between neutron-neutron, proton-proton, and neutron-proton interactions.
- The reason is also correct as the nuclear force is charge independent, which explains why the force is the same for all combinations of nucleons.

4. **Conclusion**:
- Since both statements are true and the reason correctly explains the assertion, we conclude that the assertion and reason are both true, and the reason supports the assertion.

### Final Answer:
- Assertion (A): True
- Reason (R): True
- The reason explains the assertion.