During a shot put event athletes throw a very heavy round ball called a shot as far as possible. The graph shows the vertical velocity of a shot that was thrown by an athlete. Which statement is an accurate analysis of the vertical motion of the shot? Answer choices:
A. The direction of the Velocity is upward for both the first second and the last second, and the acceleration remains constant for the entire period.

B. The direction of the velocity is downward for both the first second and the last second and the acceleration decreases and during the entire period.

C. The direction of the velocity is upward for the first second and then downward for the last second, and the acceleration decreases during the entire period.

D. The direction of the velocity is upward for the first second and then downward for the last second, and the acceleration remains constant for the entire period. ​