In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (Zi) and in each case measure the values of the corresponding angle of refraction (Zr) and angle of emergence (Ze). On the basis of your observation your correct conclusion is:

[A] Zi is more than Zr, but nearly equal to Ze

[B] Zi is less than Zr, but nearly equal to Ze

[C] Zi is more than Ze, but nearly equal to Zr

[D] Zi is less than Ze, but nearly equal to Zr