A boy throws a ball straight up in the air. After the ball leaves his hand and while it is in the air, which of the following statement is true?

• A

  the velocity and acceleration of the ball are always in the same direction

• B

  the velocity and acceleration of the ball are always in the opposite directions

• C

  the acceleration of the ball is never zero during the flight

• D

  the velocity of the ball is never zero during the flight