Answer:
B choice
Explanation:
Function is a set of ordered pairs where x-values in a set cannot be the same.
Examples
{(-1,0),(1,3),(2,0),(3,4)}
The set above is a function because there are no same x-values.
{(2,1),(2,5),(3,9),(4,7),(6,9)}
The set above is not a function because in a set, there are two same x-values which are x = 2 from (2,1) and (2,5)
From A choice, there are same -3's which makes it not a function.
From C choice, there are same 0's which makes it not a function.
From D choice, there are same -12's which makes it not a function.
The correct answer is B because there are no same x-values in a set.