When a person walks on a rought surface, the frictional force exerted by surface on the porson is opposite to the direction of his motion.
It is the force exerted by the road on the person that causes the motion.
A. If both Accertion and Reason are true and the reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but reason is not the correct explanation of Assertion.
C. If Assertion is true, but the Reason is false.
D. If Assertion is false but the Reason is true.
