[单选题]
03.10: A ball is thrown intoeb mtg3e0)n 0a the air at an 7yx4bb( iir:aoibc6-angle $\theta$ as measured from the horizontal with a velocity $v$. The horizontal velocity of the ball will be directly proportional to which of the following
A. $\theta$
B. $\sin{\theta}$
C. $\cos{\theta}$
D. $\tan{\theta}$
E. $g$