Which of the following relations has a domain of {-4, -2, 1}?

A {(1, 2), (-2, 2), (-2, 4), (-4, 4)}
B {(1, 2), (-2, 2), (-2, 4), (4, -4)}
C {(1, 2), (-2, 3), (4, 6)}
D {(-1, 2), (4, 3), (-2, 6), (-2, 3)}