Sparkling Brilliance of Diamond

The total internal reflection of light is used in polishing diamonds to create a sparking briliance. By polishing the diamond with specific cuts, it is adjusted so that most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. hence they suffer multiple reflections and ultimatley come out of the diamond from the top. This gives the diamond a sparkling brilliance.
A diamond is immersed in a liquid with a refractive index greater than water. Then the critical angle for total internal reflection will

Options

A. (a) depend on the nature of the liquid
B. (b) decreases
C. (c) remains same
D. (d) increases.