Please Help!!!

A marble is attached to a spring, the spring is pulled down, and then let go. The graphs show aspects of the marble's motion.

Which correctly describes the relationship between the velocity and acceleration of the mass undergoing harmonic motion?



A.
When the velocity of the marble is 1 cycle per second, the marble is decelerating.

B.
When the velocity of the marble is at its maximum, the acceleration of the marble is also at a maximum.

C.
When the velocity of the marble is zero, the acceleration of the marble is also zero.

D.
When the velocity of the marble is at zero, the acceleration of the marble is at its maximum in both the + and – directions.