For the Assertion (A) and Reason (R) given below, choose the correct option:
Assertion (A): Gandhiji withdrew the Non-Cooperation Movement.
Reason (R): There was violence at the Chauri-Chaura outrage.
(a)Both (A) and (R) are true and (R) is the correct explanation of (A).
(b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).