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The domain shows the x-values of a relation.
C
The domain of a relation is found by observing the unique x-values in the relation. { ( 3,- 1),( 4,2),( - 2,5),( 1,0) } For the given set of ( x,y) coordinate pairs, these values are { - 2, 1, 3, 4 }, which correspond to answer C.