(A) In crystal field theory,for an octahedral complex,the $d$-orbitals split into $t_{2g}$ and $e_g$ sets.When $\Delta_0 < P$ (where $\Delta_0$ is the

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(A) In crystal field theory,for an octahedral complex,the $d$-orbitals split into $t_{2g}$ and $e_g$ sets.When $\Delta_0 This results in a high-spin complex.For a $d^4$ system,the first three electrons occupy the $t_{2g}$ orbitals singly,and the fourth electron enters the $e_g$ orbital instead of pairing in the $t_{2g}$ orbital.Therefore,the electronic configuration is $t_{2g}^3 e_g^1$.