5. Which of the following relations is a function?
a
O A. {(2,3), (3, 4), (5, 1), (2,4)}
B. {(2,3), (3, 4), (6,2), (7,3)}
O C. {(2,3), (3, 4), (6,2), (3,3)}
O D. { (-5, 8), (9,8), (-5, 9), (0.9)}