Assertion : 1 amu is equal to 931.48 MeV.
Reason: 1 amu is equal to 1/12th the mass of `C^12` atom.

Options

A. (a) If both Assertion and Reason are true and Reason is correct explanation of the Assertion.
B. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. (c) If Assertion is true, but the Reason is false.
D. (d) If Assertion is false but the Reason is true.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "1 amu is equal to 931.48 MeV." We need to determine if this statement is true or false.

- **Fact**: 1 atomic mass unit (amu) is indeed defined in terms of energy, specifically that 1 amu is approximately equal to 931.48 MeV. This conversion comes from Einstein's mass-energy equivalence principle \( E = mc^2 \).

### Step 2: Understand the Reason
The reason states that "1 amu is equal to 1/12th the mass of the C-12 atom." We need to evaluate the validity of this claim.

- **Fact**: By definition, 1 amu is defined as 1/12th of the mass of a carbon-12 (C-12) atom. This statement is true.

### Step 3: Analyze the Relationship Between Assertion and Reason
Now we need to determine if the assertion and reason are related or if one supports the other.

- The assertion is true (1 amu = 931.48 MeV).
- The reason is also true (1 amu = 1/12th the mass of C-12).
- However, the assertion does not logically follow from the reason. The assertion is a statement about energy equivalence, while the reason is a definition of amu.

### Conclusion
- Assertion: True
- Reason: True
- Since the assertion does not logically follow from the reason, we conclude that the assertion is true, but the reason does not support it.

### Final Answer
The assertion is true, and the reason is true, but the reason does not support the assertion.

---