Maya bakes and sells birthday cakes. She charges x dollars for each cake she sells and she spends $3 for the ingredients for each cake. In one month, Maya baked and sold 15 birthday cakes. Which expression represents the dollar amount Maya earned for the month after paying for the ingredients?
Group of answer choices
A. 3(15x)
B. 15x − 45
C. 15x + 45
D. 45 − 15x