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To find the answer, we need to divide the number of boxes Milly sells by the number of boxes she sells every day.
56 boxes / 8 boxes every 3 days = 7 groups of 8 boxes
Since she sells 8 boxes every 3 days, it will take her 7 groups of 3 days to sell 56 boxes.
7 groups * 3 days/group = 21 days
Answer: D. 21 days