D And F Block Elements

Consider $|x|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $|x|$ number of unpaired electrons from the following are :

A. $\mathrm{Sc}^{3+}$

B. $\mathrm{Zn}^{2+}$

C. $\mathrm{V}^{2+}$

D. $\mathrm{Fe}^{2+}$

E. $\mathrm{Co}^{2+}$

Choose the correct answer from the options given below :