You Are Watching a Semi Truck Bounce Up and Down

Multiple Choice

You are watching a semi truck bounce up and down on a spring. (Yep it's a toy!) At the topmost point in the truck's path,

A) the truck's velocity is downward but its acceleration is upward.
B) the truck's velocity is zero but its acceleration is upward.
C) the truck's velocity is upward but its acceleration is downward.
D) the truck's velocity is zero but its acceleration is downward.