The Angle Between Two Plane Mirrors That Meet at One $\degree$

Multiple Choice

The angle between two plane mirrors that meet at one edge is 45 $\degree$ .The change in direction of a ray that strikes the first mirror at a 60 $\degree$ angle of incidence when that ray reflects from the second mirror is

A) 0 $\degree$ .
B) 45 $\degree$
C) 90 $\degree$
D) 150 $\degree$
E) 270 $\degree$