Two Boxes Are Connected to Each Other as Shown

Two boxes are connected to each other as shown.The system is released from rest and the 1.00-kg box falls through a distance of 1.00 m.The surface of the table is frictionless.What is the kinetic energy of box B just before it reaches the floor?

A) 2.45 J
B) 4.90 J
C) 9.80 J
D) 29.4 J
E) 39.2 J