Which of the following scenarios could be modeled by a step function? A. A moving company charges $65 per hour. They round minutes up to the next hour. B. A sports shop tracks its total monthly sales of surfboards over 5 years. They note a peak in sales every year in the months of June and July followed by a steady decline and almost no sales during the winter months.

C. A restaurant allows patrons to choose one meat and two sides from their lunch menu for a set price. Additional sides are $2.50 each.

D. A savings account at Best Bank provides an interest rate of 8% per year on accounts with balances of at least $1,000