Hund's rule states that the most stable arrangement of electrons (for a ground state electron configuration)

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Hund's rule states that when electrons occupy orbitals of equal energy (degenerate orbitals), they first fill each orbital with one electron before pairing up electrons in the same orbital. This results in the maximum number of unpaired electrons, all with the same spin, making the electron configuration more stable. Therefore, option D is the best choice as it matches with the most stable arrangement of electrons as per Hund's rule.

Hund's Rule States That the Most Stable Arrangement of Electrons