What is hund's rule of maximum multiplycity in the drawing of the electron configuration of element?

Explanation:

a rule based on observation of atomic Spectra which is used to predict the ground state of an atom or molecule with one or more open electronic shells the rule states that for a given electron configuration the lowest energy term is the one with the greatest value of spin multiplicity this implies that if two or more orbital's of equal energy are available electrons will occupy them singly before filling them in pairs .

The rule states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity. This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs.

it is b that is the answer.