This test wasn’t hard but I missed some because I rushed was careless and didn’t double check my answers.
A. This test wasn’t hard but I missed some because I rushed, was careless, and didn’t double check my answers.
B. This test wasn’t hard, but I missed some because I rushed, was careless, and didn’t double check my answers.
C. This test wasn’t hard but I missed some, because I rushed was careless and didn’t double check my answers.
D. No commas needed.

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