Which relation is displayed in this table?

Table is
x y
1 2
8 7
5 6
3 4

A {(1,  2), (3,  4), (5, 6), (7, 8)}
B {(2, 1), (4,  3), (6, 5), (8,7)}
C {(2, 1), (4,  3), (6, 5), (7,8)}
D {(1,  2), (3,  4), (5, 6), (8, 7)}