identify the set of ordered pairs that represent y as a function of x? PLZZZ HELP

A. (-1,0) (1,0) (3,0) (3,4)
B. (1,0) (2,0) (3,3) (3,4)
C. (0,0) (1,1) (2,3) (3,3)
D. (0,0) (0,1) (2,3) (3,4)