We know from the question that John can drive 37.6 miles per 1 gallon in the city, and 42.3 miles per gallon on the highway. Therefore, B is correct because the other options are just incorrect and contradict the statements made in the question. John wouldn't use 37.6 gallons of gas to drive a single mile, that just doesn't make sense. B. John's car uses 1 gallon of gas to drive 37.6 miles in the city.
