Jennifer uses rainwater from a barrel to water her garden. The diagram shows the amount of water she used during a 4-day period. Which of the following is closest to the fraction of a full barrel of water that Jennifer used per day?

A. [tex]\frac{1}{4}[/tex]
B. [tex]\frac{1}{12}[/tex]
C. [tex]\frac{1}{2}[/tex]
D. [tex]\frac{1}{8}[/tex]