Option 1 suggests both the assertion and reason are correct, and that the reason correctly explains the assertion. This is incorrect as the reason (R) does not appropriately justify the assertion (A).

Option 2 posits that the assertion and reason are true, but the reason doesn`t explain the assertion. This is also incorrect as the reason (R) incorrectly presumes that the Nationalist movement fought for narrow interests of social groups.

Option 3, which is the right answer, suggests that assertion (A) is true, referring to the fact that the early nationalist movement indeed had a narrow social base, while the reason (R) isn`t, given that the nationalist movement aimed for the interest of the overall nation not just narrow social groups.

Finally, Option 4 says the Assertion is false but the Reason is true, which doesn`t align with the original statements about the early nationalist movement.