Answer:
A
Explanation: well as you can see, Its correct- compared to all the other ones-
The following items were in the refrigerator: Milk, Cheese, Bread, and soda.
So after this sigh ( : ) You list what you need to as done in the sentence. Whenever you get to the last item your listing, you need to put a comma before _and_
EX: Milk, cheese, bread, and soda.
you can notice i put a comma right after that item and before the and,
remember that.