In which of the following complexes does the metal ion have the lowest ionic radius?

A

$$[\mathrm{Ti(H_2O)_6}]^{2+}$$

B

$$[\mathrm{V(H_2O)_6}]^{2+}$$

C

$$[\mathrm{Cr(H_2O)_6}]^{2+}$$

D

$$[\mathrm{Mn(H_2O)_6}]^{2+}$$