A Light Beam Is Incident Upon a Still Water Surface $\degree$

Multiple Choice

A light beam is incident upon a still water surface.What is the maximum possible value for the angle of refraction? (n_water = 1.333) .

A) 76.2 $\degree$
B) 67.5 $\degree$
C) 54.4 $\degree$
D) 48.6 $\degree$