Determine which set of ordered pairs represents a relation that is NOT a function.
A.
{(-5, -1), (-1, -1), (7, -1)}
B.
{(-5, -4), (-1, 5), (-5, 3), (7, 8)}
C.
{(-4, -5), (3, -5), (5, -1), (8, 7)}
D.
{(-4, -9), (3, -5), (5, -1), (8, 7)}
B.
{(-5, -4), (-1, 5), (-5, 3), (7, 8)}