Brian buys 5 cookies and 1 bottle of water. The total cost is $8.75. If the bottle of water costs $1.25, which equation can be used to determine the cost of 1 cookie?
A, 5c+1.25=8.75
B, 5(1.25)+c
C, 5c+8.75=1.25
D, c+1.25=8.75