From a boat on the river below a dam, the angle of elevation to the top of

Question:

From a boat on the river below a dam, the angle of elevation to the top of the dam is 21°52'. If the dam is 2376 feet above the level of the river, how far is the boat from the base of the dam (to the nearest foot)?
A) 5,910 feet
B) 5,890 feet
C) 5,900 feet
D) 5,920 feet