The Cost of Controlling Emissions at a Firm Goes Up $C ( q ) = 4,500 + 200 q ^ { 2 }$

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:
$C ( q ) = 4,500 + 200 q ^ { 2 }$
Where q is the reduction in emissions (in pounds of pollutant per day) and C is the daily cost (in dollars) of this reduction. If a firm is currently reducing its emissions by 12 pounds each day, what is the marginal cost of reducing emissions even further

A) $3,600
B) $4,800
C) $9,300
D) $1,200
E) $2,400