Two Flat Rectangular Mirrors Are Set Edge to Edge and Placed

Multiple Choice

Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.The edges of the two mirrors meet at a 30 $\degree$ angle.A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2.The angle of reflection of that ray from mirror 2 is

A) 0 $\degree$ .
B) 30 $\degree$ .
C) 60 $\degree$ .
D) 90 $\degree$ .
E) 120 $\degree$ .