Which of the relations has a domain of {-5, 0, 5}?

A. {(-5, 0), (0, 5), (1, 0)}
B. {(-5, 5), (0, 5), (5,5)}
C. {(0, -5), (0, 0), (0, 5)}
(I keep answering the correct answer so i don't know if its a glitch but yeah, help please)