31. Two bodies, A and B, collide as shown in Figures I and II below. Which statement is true?(A) They exert equal and opposite forces on each other in both I and II. (B) They exert equal and opposite forces on each other in II but not in I. (C) They exert equal and opposite forces on each other in I but not in II. (D) The forces are equal and opposite to each other in I, but only the components of the forces parallel to the velocities are equal in II. (E) The forces are equal and opposite in I, but only the components of the forces perpendicular to the velocities are equal in II.