Danielle sells a single product at $20 per unit. The firm's most recent income statement revealed unit sales of 100,000, variable costs of $800,000, and fixed costs of $400,000. If a $4 drop in selling price will boost unit sales volume by 20%, the company will experience:

a. no change in profit because a 20% drop in sales price is balanced by a 20% increase in volume.
b. an $80,000 drop in profit.
c. a $240,000 drop in profit.
d. a $400,000 drop in profit.
e. a change in profit other than those above.