Refer to the Given Figure, an Isosceles Triangle with AB $\angle A$

Multiple Choice

Refer to the given figure, an isosceles triangle with AB = AC.
-If $\angle A$ measures $117 ^ { \circ }$ find the measure of $\angle B$ .

A) $31.5 ^ { \circ }$
B) $63 ^ { \circ }$
C) $26.5 ^ { \circ }$
D) $121.5 ^ { \circ }$