The net profit for the sales of a product is equal to the total revenue from the sales of that product minus the total cost for the sales of that product. If a particular model of calculator sells for $98, and the cost for making and selling n of these calculators is $(35n + 120,000), which of the following equations expresses the net profit in dollars, P, for making and selling n of these calculators? 

A) P = 63n − 120,000 

B) P = 63n + 120,000 

C) P = 63(n − 120,000) 

D) P = 63(n + 120,000).