Which of the following statements describes perfectly elastic supply? A. The demand for pears increases by 800 percent, but Kroger continues to sell them at an unchanged price. B. The total revenue from the sale of notebooks is constant regardless of the price of a notebook. C. The price of ice cream falls by $1 a carton and Baskin Robbins continues to sell the same quantity of ice cream. D. Walgreens reports a 70 percent increase in the sales of Ibuprofen.