A 10 kg box slides 4.0 m down a frictionless ramp and collideswith a spring as shown in the figure. The spring constant is 250N/m. At what compression of the spring does the box have its maximum speed?
A) 0.0 cm
B) 18.3 cm
C) 19.6 cm
D) 36.5 cm
E) 73.0 cm