Na A B C D E (complex) — s Block Elements Chemistry Question

Question

Na $\xrightarrow{\text{H}_2\text{O}}$ A $\xrightarrow{\text{CO}_2}$ B $\xrightarrow{\text{SO}_2}$ C $\xrightarrow[\Delta]{\text{Na}_2\text{S}/\text{I}_2}$ D $\xrightarrow{\text{Ag}^+/\text{salt}}$ E (complex)