2) Which of the following statements is not true regarding a mass-spring system that moves with simple harmonic motion in the absence of friction?
A．The total energy of the system remains constant.
B．The total energy of the system is proportional to the square of the amplitude.
C．The velocity of the oscillating mass has its maximum value when the mass passes through the equilibrium position.
D．The potential energy stored in the system is greatest when the mass passes through the equilibrium position.
E．The energy of the system is continually transformed between kinetic and potential energy.