Two Clocks with Basic Timekeeping Mechanisms Consisting of (1)a Mass

Multiple Choice

Two clocks with basic timekeeping mechanisms consisting of (1) a mass on a spring and (2) a simple pendulum are taken to the top of a mountain.At the base of the mountain,they both keep perfect time.At the top of the mountain,

A) neither keeps correct time.
B) only the pendulum clock keeps correct time.
C) only the mass-spring clock keeps correct time.
D) both keep correct time.
E) Not enough information is given to answer this question.