In guiding a ship past dangerously shallow water, a light house attendant must determine the distance of the ship from the lighthouse. The lighthouse attendant sights the ship 30 degrees down from the horizontal. this 30 degrees angle is called the angle of depression. If the top of the lighthouse is about 200 feet above the sea level, how far is the ship from the base of the light house? Express your answer to the nearest foot.
A) 346 ft
B) 115 ft
C) 173 ft
D) 100 ft