Before we look at the given table, let's recall the definitions of discrete and continuous domains.
Discrete Domain: A set of input values that consist of only certain numbers in an interval.
Continuous Domain: A set of input values that consist of all possible numbers in an interval.
In the given situation, the input is a number of hats. It is only possible to have integers for a number of hats, as we cannot buy part of a hat. Therefore, the domain is discrete.
