Question

Which relation is a function?

A.
{(1, 2); (3, 2); (3, 3); (4, 2)}

B.
{(1, 2); (2, 3); (3, 4); (2, 5)}

C.
{(1, 2); (2, 3); (3, 4); (4, 5)}

D.
{(1, 2); (1, 3); (1, 4); (1, 5)}

Answer 1

C.