Correct option (A) 3 4 1 2
Explanation:
N (horizontal) changes direction from B to C, at B N (horizontal) on the hook is directed radially outward and at C directed radially inward, hence it becomes zero some where between B and C. N vertical is equal to mg therefore some where in between B & C net normal reaction is mg. At point B, ac = 0 because velocity is zero & at = 0, since no force in tangential direction.