Answer:
B. And yet, when it comes time to elect a new president, only 55% of Americans show up to cast their votes.
Explanation:
The question is asking for voter turnout <em>in the United States</em>.
Answer A is talking about voting in Australia, so it is wrong.
Answer C is also talking about Australia, so it is wrong.
Answer D is talking about general voting for countries.
Answer B, therefore, is the only one that actually only talks about Americans when it comes to voting in America, thereby making it your answer.
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