Increasing the Mass M of a Mass-And-Spring System Causes What

Multiple Choice

Increasing the mass m of a mass-and-spring system causes what kind of change in the resonant frequency of the system? (Assume no change in the system's spring constant k.)

A) The frequency increases.
B) The frequency decreases.
C) There is no change in the frequency.
D) The frequency increases if the ratio k/m is greater than or equal to 1.
E) The frequency decreases if the ratio k/m is less than 1.