Any assistance would be great!

The domain is the input values, which would also be X values.
{ x |x= -5, -3, 1, 2,6}
For this case we have by definition that the domain of a function y = f (x) is the set of all the values that the variable x takes, for which the function is defined. They are also represented by the starting set.
It is observed in the figure, that the domain is:
[tex]{x | x = -3,2, -5,1,6}\\{x | x = -5, -3,1,2,6}[/tex]
Answer:
Option A