Select the sets of ordered pairs that represent a function
A-(5-2), (1, 7), (8, 4), (0, 5), (5, -2),(-3, 0)
B- (-2,1) , (2,5) (3,-2), (1) 6), (-4, -2), (3, -4)
C-(7,5), (-5,5) , (6,-2), (7,6), (4, 8), (-2,6)
D- (4, 1) (-2,1), (-3,1) , (1, 1), (-5, 1) (8, 1)
E-(1,-1), (8, -4), (6, -6), (5, -3), (9,-2), (6, 7)
F- (-18, 15), (22, 35}, (31, -23), (15, 0), (-14, -2), (1,6)