Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Turkish invasions on India were successful. Reason (R): There was no political unity in North India. Identify the correct statement :

1) Both (A) and (R) are true and (R) is the correct explanation of (A)
2) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
3) (A) is true, but (R) is false
4) (A) is false, but (R) is true