[ Grammar ]
They were busy with their schoolwork. They spent time helping the elderly in the retirement home.
A. They were busy with their schoolwork, but they still spent time helping the elderly in the retirement home.
B. They spent time helping the elderly in the retirement home, so they were busy with their schoolwork.
C. They were busy with their schoolwork, and they spent time helping the elderly in the retirement home.
D. They spent time helping the elderly in the retirement home, or they were busy with their schoolwork.

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