C is the answer I took a similar test
Answer: 
Step-by-step explanation:
Given : The fuel efficiency of car = 7.6 km per kilogram
We also given that
1 mile = 1.609 km
Then, 
1 gallon = 3.785 liters

1 liter of gasoline = 0.729 kg
Then, 

Now, the fuel efficiency of car will be :

Hence, the car’s fuel efficiency in miles per gallon= 4.5
Answer:
This is what you have to explain:
With 5n, you are multiplying a number and a variable.
With 5 + n, you are adding a number and a variable.
Answer: Option A. 288 cubic inches