From what I can understand, they're telling you to say the types of numbers those groups fall into. So, the first group, <span>A. {1, 2, 3, 4,…}, is natural numbers. The reason for that is natural numbers are any whole numbers that are positive and not zero. The second group, </span><span>B. {0, 1, 2, 3,…}, would be whole numbers. The reason for that is whole numbers are non-negative numbers. The third group, </span><span>C. {-2, -1, 0, 1, 2,…}, would be integers. The reason for that is integers are whole numbers that extend to the negative values. </span> I really hope this helps, have a great day :)
