Which relation is displayed in this table?

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


x y
1 2
8 7
5 6
3 4