Speed of light is maximum in

Refractive index of media A, B, C and Dare: In which of the four media is the speed of light (i) maximum (ii) minimum

Refractive index of four media, A,B,C and D are given below: In which of these four media is the speed of light (i) maximum, and (ii) minimum?

The velocity of light is maximum in _____

The velocity of light is maximum in