Which of the following ordered pairs define a function? A. {( 1,2) , (2,4), (5,9), (2,3)} B. {(0,1), (1,1), (2,3), (4,2)} C. {(1,2), (2,3), (3,4), (3,5)} D. {(1,1), (2,1), (2,3), (3,5)} B. {(0,1), (1,1), (2,3), (4,2)} Explanation : According to the definition of function, for every definite value of x, the corresponding value of y is unique. : )