SO₂ Is a Dangerous Air Pollutant, Which Can Harm Human $\rarr$

SO₂ is a dangerous air pollutant, which can harm human lungs. The quantity of SO₂ in air can be determined by the reaction,
2 MnO₄^-(aq) + 5 SO₂(g) + 2 H₂O $\rarr$ 5 SO₄^2-(aq) + 2 Mn²⁺(aq) + 4 H⁺ It required 185 mL of 0.0200 M MnO₄^-(aq) solution to completely react with all of the SO₂ in a sample of air. How many grams of SO₂ were in the sample?

A) 3.70 g
B) 9.25 g
C) 0.237 g
D) 0.0948 g
E) 0.593 g