Answer:
C. The amount of gas left in Steve's car at his next visit to the gas
station is a function of the distance he drove.
Explanation:
From the question, the car starts with a full tank of gas and the more the distance covered, the less gas will be left in the car at the next visit to the gas station.
The variables to take note are the distance travelled and the amount of gas left in the car at next visit to the gas station.
This means the farther he drives, the less gas will be left in the car because longer distances travelled consumes more gas in the car thus less gas will be left when the next visit to the gas station occurs.