What system of inequalities would you use to solve the problem below? Suppose you have a job teaching swimming lessons and get paid $6 an hour. You also have a job as a cashier and get paid $8 an hour. If you cannot work more than 15 hours a week, what are the number of hours you can work at each job and still make at least $100?

A.
s + c 100
6s + 8c 15

B.
s + c 15
6s + 8c 100

C.
s + c < 15
6s + 8c > 100

D.
s + c 15
6s + 8c 100