Two identical mass–spring systems oscillate on frictionless surfaces. System X has amplitude 0.05m, and system Y has amplitude 0.15m. Which statement best describes the comparison of their periods?
a) System Y has a longer period because it travels a greater distance each cycle.
b) The two systems have the same period because period does not depend on amplitude.
c) System X has a longer period because the restoring force is smaller, so it accelerates less.
d) The system with the smaller amplitude experiences a shorter period because only small oscillations follow simple harmonic motion.