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3. O₂ gas is active while N₂ gas is inert. Please pick the correct explanations for the difference.
(A) Both of their highest occupied molecular orbitals (HOMOs) are os(2p).
(B) N2 has unpaired electrons while O₂ doesn't.
(C) The bond order of N₂ is 2 and O₂ is 3.
(D) There is significant 2s-2p orbital mixing in the O atom due to their small energy difference.
(E) The lowest unoccupied molecular orbital (LUMO) of O₂ is σ_u*(2p).