When a Light Ray in Air Enters Glass with Index $0.0^{\circ}$

Multiple Choice

When a light ray in air enters glass with index of refraction 1.60, what is the greatest angle of refraction that can occur?

A) $0.0^{\circ}$
B) $90.0^{\circ}$
C) $52.2^{\circ}$
D) $56.2^{\circ}$
E) $38.7^{\circ}$