The oxidation of `SO_(2)` to `H_(2)SO_(4)` in acid rain is thought to occur by the following mechanism.
`SO_(2)(aq)+2H_(2)O(l) rarr HSO_(3)^(-)(aq) +H_(3)^(+)(aq)`
`2HSO_(3)^(-)(aq) +O_(2)(aq)rarr S_(2)O_(7)^(2-)(aq)+H_(2)O(l)`
`S_(2)O_(7)^(2-)(aq) +3H_(2)O(l) rarr 2SO_(4)^(2-)(aq)+2H_(3)O^(+)(aq)`
Which species in this mechanism can be given the following designation?

Options

A. `{:("Reactant","catayst","Intermediate"),(SO_(2)(aq),H_(2)O(l),HSO_(3)^(-)(aq)H_(3)O^(+)(aq)):}`
B. `{:("Reactant","catayst","Intermediate"),(SO_(2)(aq),HSO_(3)^(-)(aq),S_(2)O_(7)^(2-)(aq)):}`
C. `{:("Reactant","catayst","Intermediate"),(SO_(2)(aq)H_(2)O(l),S_(2)O_(7)^(2-)(aq),HSO_(3)^(-1)(aq)):}`
D. `{:("Reactant","catayst","Intermediate"),(SO_(2)(aq)H_(2)O(l),"none",HSO_(3)^(-)(aq)S_(2)O_(7)^(2-)(aq)):}`

Answer

D