The correctly written sentence is: "I can't wait to be old enough to vote," said Felipe.
A correct sentence is a sentence that uses the right grammar and punctuation to express ideas. In the fourth option, the quoted words are enclosed in quotation marks.
The proper nouns are started with capital letters and the comma was used to separate ideas. So, it is correct.
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Answer: D."I can't wait to be old enough to vote," said Felipe.
Explanation: