OpenStudy (anonymous):

List all of the number sets that contain the number –8. A. integers only B. integers and rational numbers C. integers and natural numbers D. integers, rational numbers, and natural numbers

OpenStudy (anonymous):

We already know that -8 is an integer. Natural numbers are those that can be found in nature -- generally, this refers to $\{ 1, 2, 3, ... \}$ Note that this set does not contain negatives. Rational numbers are those that can be described as the ratio of two integers; it is a super-set of the set of integers. For example, $-8$ can be written as $-\frac{8}{1}$. Thus the answer is B.