A Thin Rod of Mass M and Length L Is

Multiple Choice

A thin rod of mass M and length L is struck at one end by a ball of clay of mass m,moving with speed v as shown in the figure.The ball sticks to the rod.After the collision,the angular momentum of the clay-rod system about A,the midpoint of the rod,is

A) (m + M/3) (vL/2)
B) (m + M/12) (vL/2)
C) (m + M/6) (vL/2)
D) mvL/2
E) mvL