Identical Balls Oscillate with the Same Period T on Earth

Multiple Choice

Identical balls oscillate with the same period T on Earth.Ball A is attached to an ideal spring and ball B swings back and forth to form a simple pendulum.These systems are now taken to the Moon,where g = 1.6 m/s²,and set into oscillation.Which of the following statements about these systems are true? (There could be more than one correct choice. )

A) Both systems will have the same period on the Moon as on Earth.
B) On the Moon,ball A will take longer to complete one cycle than ball B.
C) On the Moon,ball B will take longer to complete one cycle than ball A.
D) On the Moon,ball A will execute more vibrations each minute than ball B.
E) On the Moon,ball B will execute more vibrations each minute than ball A.