Which set of numbers includes natural numbers and zero?

The set of numbers that includes natural numbers and zero is referred to as whole numbers. Natural numbers typically start from 1 and include all positive integers (1, 2, 3, ...), while whole numbers include all natural numbers along with zero (0, 1, 2, 3, ...). This makes the whole number set the correct choice, as it is explicitly defined to include both zero and all natural numbers.

Other sets listed either do not include zero or have a different definition. Rational numbers include all numbers that can be expressed as a fraction, which encompasses a wider range than just natural numbers or whole numbers. Integers include all whole numbers and their negative counterparts, but they do not align specifically with the request for including only natural numbers and zero. The term "naturals" typically refers just to the natural numbers themselves, excluding zero. Therefore, whole numbers is the most precise choice that accurately describes the set comprising natural numbers and zero.