The domain is the set with the first values of each pair, the range is the set with the second value of each pair.
A relation maps elements from a set, the domain, into another set, the range.
Such thar a relation is represented by pairs (a, b), where it means that the element a is being mapped into the element b. (So, a is in the domain, and b in the range)
In this case, our relation is represented by:
{(-3, 2), (-2, 1), (-1,0), (0, -1)}
The domain is the set with the first values of each pair, the range is the set with the second value of each pair.
So the correct option is A.
If you want to learn more about domain and range:
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