Americans Combined Drive About 4

Americans combined drive about 4.0×10⁹ miles per day and their vehicles get an average of 20 miles per gallon of fuel used.For each 1 kg of gasoline that is burned, about 3.0 kg of CO₂ are produced.How many kilograms of CO₂ are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.

A) 2.1 × 10⁹ kg
B) 8.4 × 10¹¹ kg
C) 1.7 × 10⁸ kg
D) 93 kg
E) none of these