A Light Ray Strikes a Hexagonal Ice Crystal Floating in the Air

Multiple Choice

A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face,as shown below.The hexagonal faces of the crystal are perpendicular to the plane of the page.All the rays shown are in the plane of the page,and n_ice = 1.30.Which outgoing ray is the correct one?

A) A
B) B
C) C
D) D
E) E