2018 AMC 10A Problem 2

Let $x$ be the number of gallons of soda that Jacqueline has. Then Alice has $1.25x$ gallons, and Liliane has $1.5x$ gallons. Therefore, the relationship can be found by dividing the amount of soda that each has to yield $\dfrac{1.5x}{1.25x}=1.2,$ which means Liliane has $20\%$ more soda than Alice. Thus, A is the correct answer.