Moreover, the materials given in the title are not very comprehensive, and there are many. Through such a trivial matter, we can't know how much democracy in Athens has improved, and we can't draw conclusions from point to area, so ① is wrong. But at least we can know that their citizens have the right to vote and stand for election, and their democratic rights have expanded. So, ③ is right.
So the comprehensive analysis, the answer should be C.