A company that produces thumb drives has determined that its maximum profit occurs when it sells 5,000 units per month. For every 500 units above or below 5,000 the company sells, its profit decreases by 1,500 which of the following could be the number of units sold in a month if the companys profit decreased by 12,000 from the maximum? round the answer to the nearest whole number
A. 100 or 900 units
B. 1,000 or 9,000 units
C. 460 or 540 units
D. 4,600 or 5,400 units