A recipe calls for 4 eggs, but Mara only has 3. She decides to adjust the amounts of the other ingredients proportionally. The original recipe calls for 1/2 cup of sugar. Which expression represents the amount of sugar, in cups, she should use?
A.1/2 + 3/4
B.3/4 - 1/2
C.1/2 x 3/4
D.3/4 ÷ 1/2