A Vertical Spring Has a Mass Hanging from It, Which

Multiple Choice

A vertical spring has a mass hanging from it, which is displaced from the equilibrium position and begins to oscillate. At what point does the system have the least potential energy?

A) at the highest point
B) at one-fourth of the distance between the highest point and lowest point
C) at the lowest point
D) at the point where the spring is unstretched
E) at the equilibrium point