[单选题]
03.10: A ball is thrown into th;/ gn0n0dm l3fpudb0ae air fl9kq9 f h/czv)8s 6mtat an 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. $g$
