A baker has a bag with 20 cups of flour. The baker plans to use the flour to make 4 loaves of bread.
Each loaf of bread uses 4 1/2 cups of flour.
How many cups of flour will remain when the baker finishes making the 4 loaves of bread?

A. 2 cups
B. 2 1/2 cups
C. 3 cups
D. 3 1/2 cups

Please help TvT