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Answer
Option B is correct.
There are two X-values of 5, even though their y-values are different.
Explanation
A function is an expression that takes up each value of an independent variable (x) and gives a corresponding value of a dependent variable (y) without the same values of the independent variable (x) giving different values of the dependent variable (y).
With the ordered pairs written as (x, y), we can see that 5 occurs two different times, with different y values in the two cases. This disqualifies the relation from being a function.
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