Answer:
A. John hit the baseball it went over the fence.
Step-by-step explanation:
A. is the run on sentence, for it does not make sense as placed. It needs either a semi-colon, comma, or be split into two sentences.
I.e.:
John hit the baseball; It went over the fence.
John hit the baseball, it went over the fence.
John hit the baseball. It went over the fence.
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