The demand model for a certain product is given below, where p represents the price of the product, and y represents the number of units in demand. Interpret the slope.

y = 4,500 - 450p

A. For each dollar the price increases, demand decreases by 450 units.

B. For each dollar the price increases, demand increases by 450 units.

C. For each dollar the price decreases, demand decreases by 4,500 units.