What claim is Hunter supporting with research in this excerpt from "Compulsory Voting: An Idea Whose Time Has Come"?

In the following 1924 election, voter turnout in Australia climbed to 91% and has remained around 95% ever since.

A.Compulsory voting is old-fashioned and upsetting to modern Americans. B.Campaigns often focus on voters on extreme ends of the political spectrum. C.Many people consider the idea of being forced to vote as un-American. D.Other countries have found success implementing compulsory voting.