The correct statement among the options provided is:
Whole numbers include all natural numbers and zero.
To clarify the other statements:
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All rational numbers are also integers: This is false. Rational numbers include fractions (like 1/2, 2/3) that are not integers.
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Not all natural numbers are real numbers: This is false. All natural numbers are indeed real numbers.
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Irrational numbers are also: This statement seems incomplete, but generally, irrational numbers are not rational and do not fit into the categories of integers or whole numbers.
Therefore, if you are looking for a true statement based on conventional definitions, focus on whole numbers including all natural numbers and zero.