Find the Unknown Sides of the Right Triangle (See Illustration) $$a = 19.7 \mathrm {~km} , \angle B = 63.7 ^ { \circ }$$

Multiple Choice

Find the unknown sides of the right triangle (see illustration) . Round your answer to the appropriate number of significant digits. $$a = 19.7 \mathrm {~km} , \angle B = 63.7 ^ { \circ }$$

A) b = 39.9 km, c = 44.5 km
B) b = 22.0 km, c = 39.9 km
C) b = 32.5 km, c = 38.0 km
D) b = 9.74 km, c = 8.73 km
E) b = 17.7 km, c = 9.74 km