A break-even chart shows maximum unit sales at 100 each and achieves a maximum profit of 100,000, a break-even point of 2,143 units, and a loss of 75,000 if no units are sold. What is the 'margin of safety'? Select one: O A. 2,143 units O B.2,857 units O C. 1,000 units O D. 5,000 units