A Mass Is Bouncing on the End of a Spring

Multiple Choice

A mass is bouncing on the end of a spring with a period T when measured by a ground observer.What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.600c?

A) 0.440 T
B) 1.25 T
C) 0.600 T
D) 1.67 T