A Glass Plate Whose Index of Refraction Is 1

A glass plate whose index of refraction is 1.57 is immersed in a liquid.The surface of the glass is inclined at an angle of 54° with the vertical.A horizontal ray in the glass is incident on the interface.The liquid is an oil whose index of refraction is 1.40.The incident horizontal ray refracts at the interface.The angle that the refracted ray,in the oil,makes with the horizontal is closest to:

A) 11°
B) 5.6°
C) 8.3°
D) 14°
E) 17°