Damon’s car can go an average of 18 miles on each gallon of gas. If m represents the number of miles, which equation models this situation?

A. m = 118g, where g is the miles per gallon of gas.

B. m = 18g, where g is 1 gallon of gas.

C. m = 118g, where g is the number of gallons of gas.

D. m = 18g, where g is the number of gallons of gas.