Bohr model is a system consisting of small, dense nucleus surrounded by orbiting electrons. The electrons travel is defined circular orbits around the nuclues which orbital angular moementum is an integral multiple of `h/(2pi)`. While rotating in allowed orbits (stationary orbits) the electron does not radiate energy. electromagnetic radiations are emitted when the electron jumps from a higher orbit `(E_(ni))` to a lower orbit `(E_(nf))`.
The total energy of the electron in an atom is negative. It suggests that

Options

A. Energy is emitted if electron is to be removed from the atom
B. Energy has to be supplied if the electron is to be removed from the atom.
C. Electrons cannot be removed from the atom.
D. Energy of the electron is zero.