Directions: Choose the correct option:

Assertion $\left(A\right):$ Fishes are not considered tetrapods.

Reason $\left(R\right):$ They have paired fins.

1. Both assertion$\left(A\right)$ and reason$\left(R\right)$ are true, but reason$\left(R\right)$ is not the correct explanation for assertion.
2. Both assertion$\left(A\right)$ and reason$\left(R\right)$ are true and reason$\left(R\right)$ is the correct explanation for assertion$\left(A\right).$
3. Assertion$\left(A\right)$ is false and reason$\left(R\right)$ is true.
4. Assertion$\left(A\right)$ is true and reason$\left(R\right)$ is false.

The correct option is B Both assertion$\left(A\right)$ and reason$\left(R\right)$ are true and reason$\left(R\right)$ is the correct explanation for assertion$\left(A\right).$

Correct option: $\left(a\right)$Both assertion$\left(A\right)$ and reason$\left(R\right)$ are true and reason$\left(R\right)$ is the correct explanation for assertion$\left(A\right).$

$\bullet$ Tetrapod is a superclass of animals that includes all limbed vertebrates that primarily live on land.

$\bullet$ Fishes are adapted to live in aquatic habitats.

$\bullet$ As a result, instead of limbs, they have paired fins that assist them in swimming, balance, stability, and steering.

$\bullet$ So, fishes are not considered as tetrapods due to the presence of fins.

$\bullet$ So, the correct answer is $\left(a\right).$