A Light Ray in Material 1 Goes into Material 2 $^{\circ}$

Multiple Choice

A light ray in material 1 goes into material 2.The angle of incidence in material 1 is 40.0 $^{\circ}$ and the angle of refraction in material 2 is 31.0 $^{\circ}$ .If the index of refraction of material 1 is 1.60,what is the index of refraction of material 2?

A) 3.20
B) 2.00
C) 1.88
D) 1.41
E) 1.20