A 1.0 kg box resting on a frictionless surface is attached to a horizontal spring which is attached to a wall. The mass is then pulled back and released from rest. Which of the following statements is true about the subsequent motion of the box?
a) The box oscillates with constant amplitude.
b) The box oscillates with decreasing amplitude.
c) The box oscillates with increasing amplitude.
d) The box oscillates with simple harmonic motion.