Jennifer and Margaret have to make brownies for a bake sale. Jennifer can bake a dozen brownies in 20 minutes and Margaret can bake 15 brownies every half hour. Jennifer bakes for 1 hour and 40 minutes and Margaret bakes for 2 hours. How many brownies do the girls have for the sale altogether?
A. 27 brownies
B. 60 brownies
C. 117 brownies
D. 120 brownies
Choose one correct answer.