Solve the Problem $\angle x=(5 n-17)^{\circ}, \angle y=(n+12)^{\circ}, \angle z=(171-5 n)^{\circ}$

Multiple Choice

Solve the problem.
-Find the measure of the indicated exterior angle.

$\angle x=(5 n-17) ^{\circ}, \angle y=(n+12) ^{\circ}, \angle z=(171-5 n) ^{\circ}$

A) $100 ^ { \circ }$
B) $181 ^ { \circ }$
C) $153 ^ { \circ }$
D) $91 ^ { \circ }$