Which equation represents the following word problem? Grace is making a cake. The recipe calls for 21∕2 cups of flour. If she has already added 3∕4 of a cup into the bowl, how much more flour will she need to add? Let x be the number of cups she needs to add.
Question 4 options:

A)

3∕4x = 21∕2

B)

x + 3∕4 = 21∕2

C)

X/(3/4)

D)

x – 3∕4 = 21∕2