Final answer:
The given set of points represents a function that is a horizontal line at some negative value.
Step-by-step explanation:
The given set of points represents a function. To determine the nature of the function, we can observe the y-values of the points. In this case, all the y-values are the same (-5). This means that regardless of the x-values, the function remains constant at y = -5. Therefore, the function represents a horizontal line at the value of -5.
So, the correct answer is option c. It is a horizontal line at some negative value.