Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to $\mathrm{VI}$.

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

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

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

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

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

Choose the correct answer from the options given below.