The graph shows the amount of water that remains in a barrel after it begins to leak. The variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel.

what does the y-intercept represent?

a. the amount of water that is added tot he barrel each day
b. the amount of water that remains in the water barrel
c. the amount of water that is initially in the water barrel
d. the amount that the water barrel decreases each day