Final answer:
Megan used more solution per gallon of water than Desmond, because 5 mL is greater than 2 mL.
Step-by-step explanation:
The correct statement is: Megan used more solution per gallon of water than Desmond, because 5 mL of solution is greater than 2 mL of solution.
When comparing the two ratios, 5:1 and 8:2, we can simplify them to 5:1 and 4:1 respectively. Both ratios indicate that Megan and Desmond added the same amount of solution per gallon of water. However, when comparing the actual amounts of solution used (5 mL and 2 mL), Megan used more solution per gallon of water than Desmond.
Therefore, the statement that Megan used more solution per gallon of water than Desmond is true because 5 mL is greater than 2 mL.