A Bullet with a Mass of 12 G Moving Horizontally $\times$

A bullet with a mass of 12 g moving horizontally strikes a fixed block of wood and penetrates a distance of 5.2 cm.The speed of the bullet just before the collision is 640 m/s.The average force that the wood exerted on the bullet was

A) 4.7 $\times$ 10⁴ N
B) 74 N
C) 4.7 $\times$ 10⁶ N
D) unknown; the mass of the wood is required
E) None of these is correct.