A Mass Hangs from a Spring That Is Fixed to the Ceiling

A mass hangs from a spring that is fixed to the ceiling. The mass is now pulled down and released so the mass oscillates up and down. Which of the following statements is true?

A) The kinetic energy of the oscillating mass is a constant.
B) Adding mass to the spring will make it oscillate faster.
C) The restoring force of the spring is equal to the weight of the mass.
D) The gravitational force on the mass oscillates at the same frequency as the mass.
E) None of these is true.