Two boxes are connected over a frictionless pulley and held at rest as shown below. . Box A has a mass of 15 kg and Box B has a mass of 12 kg. When the system is released Box A moves downward and Box B moves upward. A B Choose the statement that best describes the situation just before box A hits the floor. - a) At that moment, the gravitational potential energy of Box A before release = final kinetic energy of Box A + final kinetic energy of box B + gravitational potential energy of Box B due to its height above the floor. O b) At that moment, the gravitational potential energy of Box A before release = final kinetic energy of box A + final kinetic energy of Box B c) At that moment the gravitational potential energy of Box A before release = final kinetic energy of Box B + gravitational potential energy of Box B due to its height above the floor. O d) At that moment the gravitational potential energy of Box A before release = gravitational potential energy of Box B due to its height above the floor