If a flagpole casts a 13ft shadow on the ground when the sun is at 68° angle of elevation, which of the following expressions can be used to determine the height (h) of the flagpole? (Assume the flagpole is at a right angle to the ground.)

A) cot 68° = h/13

B) cos 68° = h/13

C) tan 68° = h/13

D) sin 68° = h/13