What Is Brewster's Angle for Light Traveling in Vacuum and Reflecting

What is Brewster's angle for light traveling in vacuum and reflecting off a piece of glass having a refractive index of 1.52?

A) $33.3 ^ { \circ }$
B) $48.9 ^ { \circ }$
C) $41.1 ^ { \circ }$
D) $56.7 ^ { \circ }$
E) $48.1 ^ { \circ }$