X 4 1 4 16 10 -19

Y -20 -17 -14 5 0 -16

A. Function
B. Not a function
C. Not enough information

A. Function

C. Not enough information

To determine whether the given set of points represents a function, we need to have multiple points with the same x-coordinate. However, in the given set, each x-coordinate has a unique corresponding y-coordinate. Thus, we cannot determine if the set represents a function or not without additional information.

To determine if the given pairs of X and Y values represent a function, we need to examine each X value and determine if it is associated with a unique Y value.

Let's write down the pairs of X and Y values:
X: 4 1 4 16 10 -19
Y: -20 -17 -14 5 0 -16

We can see that X = 4 appears twice in the list. If each X value is associated with a unique Y value, then this would indicate that the pairs do not represent a function. However, if two different X values can have the same Y value, it is still possible that the pairs represent a function.

In this case, for X = 4, we have two corresponding Y values, -14 and 5. So, the pairs of X and Y values do not represent a function because X = 4 is associated with more than one Y value.

Therefore, the answer is B. Not a function.