A corner store sells two kinds of baked goods: cakes and pies. A cake costs $5 and a pie costs $7. In one day, the store sold 15 baked goods for a total of $91. How many cakes did they sell?
A7 cakes
B4 cakes
C8 cakes
D5 cakes
A7 cakes
B4 cakes
C8 cakes
D5 cakes