Which one of the following sentences is punctuated correctly?
A. She kept my surprise a secret, but she had a hard time doing it.
B. Darleen chose Tara, Holly, and, Marlene as her lab ...
C. I found a large, smooth, rock on the beach yesterday.
D. Della arrived on time, it was just two o'clock.
Della arrived on time, it was just two o'clock.
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