[单选题]
A girl throws a rock horizontally, with a velocity of 10nri)qk.rzq d1bu 78z( m/s, from+bqhu i( f2bd7 a bridge. It falls 20 m to the water below. How far does the rock travel horizontallf 2b(bu+ hqd7iy before striking the water?
A. $14 \; m$
B. $16 \; m$
C. $20 \; m$
D. $24 \; m$