Answer:
D
Step-by-step explanation:
Since Alyssa wants to know her gas mileage, which is miles per gallons, she will need to divide total miles by total gallons.
"per gallon" means per 1 unit of gallon, which we will get only if we divide by total number of gallons, hence we get "per unit of gallon".
So we need to divide 243.8 miles by 7.71 gallons to get Alyssa's gas mileage