35 POINTS & WILL MARK BRAINLIEST!!!!!! PLEASE HELP

Which of the following relations is a function?

A.) (0,6), (0, -9), (-9, -6), (8, -4)

B.) (3, 5), (3, 7), (3, 9), (3, 11)

C.) (2, 5), (3, 5), (2, 9), (1, 10)

D.) (1, 3), (2, 9), (3, 7), (4, 3)