Which of these is th balanced equation showing how acid rain forms?

The first one, a. on the left hand side, there are a total of 1 Sulfur, 4 oxygens, and 2 hydrogens. the right hand side is the same. its balanced. keep that in mind so you know how to do others. just add all of the same particles together. its definitely not b, because ther is no trioxide In that eqtn!! and acid rain is sulfuric acid isnt it? we dont get here, we arent taught it.