Bohr's Quantum Condition on Electron Orbits Required

Multiple Choice

Bohr's quantum condition on electron orbits required

A) that the angular momentum of the electron about the hydrogen nucleus equal nh/2π) .
B) that no more than one electron occupy a given stationary state.
C) the electrons to spiral into the nucleus while radiating electromagnetic waves.
D) that the energies of an electron in a hydrogen atom be equal to nE_o, where E_o is a constant energy and n is an integer.
E) None of these is correct.