Which of the relations given by the following sets of ordered pairs is a function? A. {(1,2),(2,3),(3,4),(2,1),(1,0)}
B. {(2,−8),(6,4),(−3,9),(2,0),(−5,3)}< br /> C. {(1,−3),(1,−1),(1,1),(1,3),(1,5)} D. {(−2,5),(7,5),(−4,0),(3,1),(0,−6)}