The Figure Represents the Parabolic Trajectory of a Ball Going $\theta$

Multiple Choice

The figure represents the parabolic trajectory of a ball going from a to e in Earth gravity but without air resistance. The initial velocity of the ball is V_o at an angle $\theta$ to the horizon. The vertical dashed lines represent equal time interval, $\Delta$ t. Consider "up" as the positive direction. The vertical velocity at point b is [Note: g = 9.81 m/s²) ]

A) 0.
B) V_o cos $\theta$ ) - ½ g 2 $\Delta$ t) ².
C) V_o sin $\theta$ ) - ½ g 2 $\Delta$ t) ².
D) V_o sin $\theta$ ) + ½ g 2 $\Delta$ t) ².
E) V_o cos $\theta$ ) + ½ g 2 $\Delta$ t) ².