**We know that all gases contains 22.4 L volume**

**22.4 liter of SO**_{2} = 6.223x10^{23} atoms

so for 1 liter= (6.223x10^{23})/22.4 = Same for 1 litre of CO_{2}.

**So, Number of atoms for 1 gram of SO**_{2} = Number of atoms 1 gram of CO_{2}

**Hence option (A) is correct**