Solve the Problem $91^{\circ}$ Their Difference Is $21^{\circ}$ Find the Angles

Multiple Choice

Solve the problem.
-Two angles have a sum of $91^{\circ}$ . Their difference is $21^{\circ}$ . Find the angles.

A) $71^{\circ}$ and $20^{\circ}$
B) $54^{\circ}$ and $37^{\circ}$
C) $37^{\circ}$ and $58^{\circ}$
D) $56^{\circ}$ and $35^{\circ}$