The <em><u>correct answer</u></em> is:
(b) {1, 2, 3, 4, 5, 6, 7, 8}
Explanation:
In this problem, we use the variable c to represent the independent quantity. This means that the domain is all possible values for c.
Since the store only has 8 cases of water, the domain cannot be any number larger than 8.
Since the store only sells complete cases, not partial cases, of water, the domain cannot be a fraction or decimal number.
This means that the practical domain, or domain that makes sense for the problem situation, is {1, 2, 3, 4, 5, 6, 7, 8}.
