Alice had 4 1/4 pounds of walnuts at the beginning of the week. At the end of the week, she had 2 3/4 pounds. How much has she used?
A1 3/4
B1 1/2
C2 1/2
D1 1/4
A1 3/4
B1 1/2
C2 1/2
D1 1/4