The answer to your question is A.) 64 cups!!
This is because if Samantha bought 8 half gallons we can add it up together and make it a full bottle because 8 is even so two half bottles will equal a full which would mean there would be four full gallons!! Now it’s time to convert! 0.063 gallons equals 1 cup so if you do the adding and converting basically you will have your answer which is 64 cups!!
Hopefully this helped have a nice day ;)