Which of the following complex will show largest splitting of d-orbitals?

The spin only magnetic moment of ${\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ complexes is $\mathrm{B}.\mathrm{M}.$ (Nearest integer)

(Given atomic number of $\mathrm{Mn}=25$)