Question

Which relation is also a function?

A {( 5, 8), (5, 9), (8, 9), (10, 8)}
B {( 5, 8), (7, 9), (8, 9), (10, 8)}
C {( 5, 8), (7, 9), (7, 5), (10, 8)}

Answer 1

The answer is B. B is the only one where all the inputs only have 1 output.