A Student Designs a Clock Using a Mass and a Spring

A student designs a clock using a mass and a spring. Each oscillation of the mass advances the clock by one second. When the student builds the clock, he discovers he erred and each oscillation takes two seconds. What change can he make to fix the clock?

A) double the amplitude of the oscillations
B) quadruple the spring constant of the spring
C) double the spring constant of the spring
D) quadruple the mass
E) double the mass