Katrina drinks 0.5 gallons of water per day. Which expression shows how to find the number of cups of water she drinks in a week?
There are 16 cups in a gallon.

A. 0.5 gallons/1 day × 16 cups/1 gallon × 1 week/7 days
B. 0.5 gallons/1 day × 1 gallon/16 cups × 7 days/1 week
C. 0.5 gallons/1 day × 1 gallon/16 cups × 1 week/7 days
D. 0.5 gallons/1 day × 16 cups/1 gallon × 7 days/1 week