Roasting of sulphides gives the gas X as a by-product. This is a colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueoussolutionis acidic, acts as a reducing agent and its acid has never been isolated. The gas X is:

A

$$SO_{3}$$

B

$$H_{2}S$$

C

$$SO_{2}$$

D

$$CO_{2}$$