Which of the following statements about the break-even point is true, assuming all other things are equal? a. The break-even point changes in the opposite direction as changes in the unit selling price. b. The break-even point changes in the opposite direction as changes in the variable cost per unit. C. The break-even point changes in the same direction as changes in the unit contribution margin. d. The break-even point changes in the opposite direction as changes in fixed costs