Which of the following is an example of counting numbers?

Counting numbers are defined as the set of positive integers that start from 1 and go on indefinitely: 1, 2, 3, 4, 5, and so forth. They do not include zero or any negative numbers.

In the given choices, the second option includes 1, 2, 3, 4, and continues on, embodying the essence of counting numbers by starting from 1 and listing all subsequent positive integers. This aligns precisely with the definition of counting numbers.

The other choices either start from zero or include negative numbers, which disqualifies them from being classified as counting numbers. This specificity is essential for distinguishing counting numbers from other types of numbers, such as whole numbers or integers.