The type of hybridization and magnetic property of the complex [MnCl₆]^3–, respectively, are

 [MnCl₆]³⁻ Cl ion exists as a weak field ligand ,4 unpaired electrons are present it forms outer orbital complex ${\mathrm{SP}}^3{\mathrm{d}}^2$, Paramagnetic  due to unpaired electrons.

Hence, correct option is: (D) ${\mathrm{SP}}^3{\mathrm{d}}^2$,Paramagnetic