13. In an $\mathrm{O_h}$ field, the ground term for a $d^2$ free ion $(^{3}F)$ splits into:
(A) $\mathrm{A_{1g} + E_g}$
(B) $\mathrm{A_{2g} + T_{1g} + T_{2g}}$
(C) $\mathrm{T_{1u} + T_{2u}}$
(D) $\mathrm{E_g + T_{2u}}$
(E) $\mathrm{A_{2u} + E_u}$

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