Stan Argues That Momentum Cannot Be Conserved When a Collision

Multiple Choice

Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because

A) each body exerts an equal and opposite force on the other during the collision.
B) the forces act during equal time intervals.
C) the law of conservation of momentum for an isolated system is a vector equation.
D) of all of the above.
E) of only (a) and (b) above.