A Girl Throws a Rock Horizontally,with a Velocity of 10

Multiple Choice

A girl throws a rock horizontally,with a velocity of 10 m/s,from a bridge.It falls 20 m to the water below.How far does the rock travel horizontally before striking the water,assuming negligible air effects?

A) 14 m
B) 16 m
C) 20 m
D) 24 m