Suppose the Amount of Carbon Dioxide (In Pounds Per 15,000 $10 x ^ { 2 } - 580 x + 30,803$

Suppose the amount of carbon dioxide (in pounds per 15,000 miles) released by a typical sport utility vehicle (SUV) depends on its fuel efficiency according to the formula
$10 x ^ { 2 } - 580 x + 30,803$
Where x is a fuel efficiency of an SUV in miles per gallon. According to the model, what is the fuel efficiency of an SUV that has the least carbon dioxide pollution

A) 14 miles per gallon
B) 19 miles per gallon
C) 18 miles per gallon
D) 32 miles per gallon
E) 29 miles per gallon