What kind of numbers includes only non-negative integers?

The correct answer is that whole numbers include only non-negative integers. Whole numbers are defined as the set of all non-negative integers, which means they begin at zero and continue infinitely with 1, 2, 3, and so forth. This set includes zero and all positive integers without any negative numbers or fractions.

Natural numbers, while often starting at 1 and continuing in the positive direction, do not include zero, which precludes them from fitting the definition of non-negative integers.

Integers encompass all whole numbers, including positive integers, negative integers, and zero, which again exceeds the criteria of including only non-negative integers.

Rational numbers include all numbers that can be expressed as a fraction of integers, which also extends to negative values, decimals, and thus does not align with the requirement of being strictly non-negative.

Therefore, whole numbers represent the correct category of numbers exclusively consisting of non-negative integers, which makes this choice accurate.