Assertion(a): “Biological species” concept helps to ask how species are formed

Reason(r): Concept of biological species is centred around the question of how reproductive isolation comes about

Options :

1. Both (a) and (r) are correct, but (r) is not the explanation for (a)

2. Both (a) and (r) are correct, (r) is the correct explanation for (a)

3. (a) and (r) both are incorrect

4. (a) is true, (r) is incorrect