A Sample of Rainwater Collected near a Lead Smelter Is

A sample of rainwater collected near a lead smelter is analyzed for acid content. Experiments show that a 100. mL sample of the rainwater is neutralized by 22.4 milliters of 0.0122 M NaOH. Assuming that the acid present is sulfurous acid, which resulted from the reaction of SO₂ with water, what is the molarity of acid in the rainwater

A) 1.17 * 10^-3 M
B) 1.27 * 10^-3 M
C) 1.37 * 10^-3 M
D) 1.47 * 10^-3 M
E) None of the above