(1 pt) Which of the following represents a function?    A.      X = 1 1 1 1 1             Y=2 3 4 5 6                                                         B.     X =1 2 1 2 1         Y= 0 1 2 3 4                                                   C.    X= -2 -1 0 -1 -2       Y= 2 3 4 5 6                                                                                                  D.    X= 1 2 3 4 5        Y= 5 4 3 2 1                                      

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D, because for each element of the set of X, there is only one corresponding element of the set of Y.