Assertion (A) `:` Amphibians have evolved from fishes .
Reason (R ) `:` Archaeopteryx is a fossil linking fishes and amphibians
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true, but Reason is false
(d) If both Assertion and Reason are false.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false
D. If both Assertion and Reason are false.

Answer

To solve the question, we need to evaluate the Assertion (A) and the Reason (R) provided:

**Assertion (A):** Amphibians have evolved from fishes.
**Reason (R):** Archaeopteryx is a fossil linking fishes and amphibians.

### Step-by-Step Solution:

1. **Evaluate the Assertion (A):**
- The statement "Amphibians have evolved from fishes" is scientifically accurate. Amphibians are indeed believed to have evolved from fish-like ancestors during the Devonian period. This transition marks a significant evolutionary step from aquatic to terrestrial life.

2. **Evaluate the Reason (R):**
- The statement "Archaeopteryx is a fossil linking fishes and amphibians" is incorrect. Archaeopteryx is actually a transitional fossil that links birds and reptiles, not fishes and amphibians. Therefore, this statement is false.

3. **Determine the relationship between Assertion and Reason:**
- Since Assertion (A) is true and Reason (R) is false, we can conclude that the correct option is (c) - "If Assertion is true, but Reason is false."

### Final Answer:
The correct option is (c) If Assertion is true, but Reason is false.

---