The evidence Hunter give in "Compulsory Voting: An Idea Whose Time Has Come" that supports his claim that other countries have successfully implemented compulsory voting was, The high voter turnout in Australia.
Compulsory means enforced to do something.
Because Australia was the first country to record highest vote. Ans this improved the low rate of Commonwealth Election Act and increase the dramatic voter turnouts. That's why compulsory voting was implemented
Hence the correct option is, A. The high voter turnout in Australia
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