Statement (A): Angular momentum of electron in orbits is quantized. 

Statement (B): While revolving in stationary orbits electrons do not lose energy. 

Statement (C): $\mathrm{mvr}=\frac{\mathrm{nh}}{2\mathrm{\pi }}$

A) electron jump from ground state to existed state its absorbs energy and excited state to ground state its release the energy in the form of small packets the energy is quantized. 

B) Centripetal force = centrifugal force 

C) The angular momentum of electron is equal to the $\mathrm{mvr}=\frac{\mathrm{nh}}{2\mathrm{\pi }}$