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Which sentence below uses all commas correctly?
A. Before we could go to the movie, we had to clean our rooms, wash the dog and water the flowers.
B. Before we could go to the movie, we had to clean our rooms wash the dog and water the flowers.
C. Before we could go to the movie we had to clean our rooms, wash the dog, and water the flowers.
D. Before we could go to the movie, we had to clean our rooms, wash the dog, and water the flowers.
What is D. Before we could go to the movie, we had to clean our rooms, wash the dog, and water the flowers.