The Cost of Controlling Emissions at a Firm Goes Up $C ( q ) = 3,500 + 150 q ^ { 2 }$

Multiple Choice

The cost of controlling emissions at a firm goes up rapidly as the amount of emissions reduced goes up. Here is a possible model:
$C ( q ) = 3,500 + 150 q ^ { 2 }$
Where q is the reduction in emissions (in pounds of pollutant per day) and C is the daily cost to the firm (in dollars) of this reduction. Government clean air subsidies amount to $750 per pound of pollutant removed. How many pounds of pollutant should the firm remove each day to minimize net cost (cost minus subsidy)

A) 2 pounds
B) 10 pounds
C) 2.5 pounds
D) 5 pounds
E) 75 pounds