Final answer:
Option 'c' is the correct choice as it contains only integers, which are whole numbers that include positive, negative, and zero values, with no fractions or decimals.
Step-by-step explanation:
The question is asking which set contains only integers. Integers are whole numbers that can be positive, negative, or zero, but they do not include fractions or decimals. Given the provided options, the one that contains only integers is 'c. 1, 2, 0, -3, 2, -5'. All of these values are whole numbers without any decimal or fractional parts.