Which sentence is grammatically correct?
A. Jaden and Ariel worked on their math homework for the entire period but they did not finish it.
B. Jaden and Ariel worked on their math homework for the entire period, but they did not finish it.
C. Jaden and Ariel worked on their math homework for the entire period but, they did not finish it.
D. Jaden and Ariel worked on their math homework for the entire period and they did not finish it.

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