Hello!
The answer is: A. 4.5 L
Why?
According to the conversion factor which states that:

It means that we have 3.78 L per each gallon or it's equal to say that we 0.26 gallon per each L.The SI unit for liquid volume is the Liter (L)
Let's make the calculations:

So, we have 4.54 L in 1,2 gallons.
Have a nice day!