Which of the following would be an example of an integer?

An integer is defined as a whole number that can be positive, negative, or zero, and it does not include fractions or decimal points. The number -2 fits this definition perfectly, as it is a whole number that is negative. It is an integer because it lies on the number line without any fractional or decimal component.

In contrast, the other options either represent decimal values or fractions. For example, 3.5 and 0.1 are both decimal numbers, and thus not integers. Similarly, 1/2 is a fraction, which also disqualifies it from being classified as an integer. Therefore, the only valid example of an integer among the choices is -2.