Answer:
The sentence that uses commas correctly is C.
"Pete needed help with his math homework, so I went to his house to study with him."
Commas should be used to separate nonessential information or to indicate a pause in the sentence. In this case, "so I went to his house to study with him" is essential to the meaning of the sentence and should not be separated by commas. However, the phrase "Pete needed help with his math homework" could be separated by commas because it provides additional, nonessential information.
Step-by-step explanation:
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