The sets of ordered pairs below are functions except
A. {(1,1),(-1,-1),(0,0), (2,4),(-2,4)}
C. {(1,2), (-2,-1),(-2, 0),(4,5), (3, 8)}
B. {(1,3), (-3,-1),(4, 6), (0, 2), (-2, 0)} D. {(1,4), (2, 3), (3, 2), (4,1), (5,0)}​