From a Point on Ground Level, You Measure the Angle $37 ^ { \circ }$

Multiple Choice

From a point on ground level, you measure the angle of elevation to the top of a mountain to be $37 ^ { \circ }$ . Then you walk $150 \mathrm {~m}$ farther away from the mountain and find that the angle of elevation is now $20 ^ { \circ }$ . Find the height of the mountain.

A) $55$ m
B) $84$ m
C) $81$ m
D) $113$ m
E) $106$ m