A reaction pathway is illustrated. $\text{SO}_2 \xrightarrow{1} \text{SO}_3 \xrightarrow{2} \text{H}_2\text{SO}_4 \xrightarrow{3} \text{H}_2\text{S} \xrightarrow{4} \text{SO}_2$ At each step in this pathway, sulfur is oxidised, reduced, or neither oxidised nor reduced. Which row is correct?
- A1 neither, 2 oxidised, 3 reduced, 4 reduced
- B1 oxidised, 2 neither, 3 reduced, 4 reduced
- C1 oxidised, 2 neither, 3 reduced, 4 oxidised
- D1 oxidised, 2 oxidised, 3 reduced, 4 oxidised