A Friend Argues That If Mass Were Really Conserved He

A friend argues that if mass were really conserved he would never need to refill his gas tank. What explanation do you offer your friend?

A) The atoms (mass) of gasoline are converted into energy by the engine according to E=m .
B) The Law of Conservation of Mass does not apply to reactions involving combustion or explosion of matter.
C) The atoms (mass) of gasoline are converted into exhaust fumes.
D) The oil companies make gasoline in a way that it gets used up so that we are always required to replenish it.