The number that fits into all the following number sets: natural number, whole number, and integer is 12.
- Natural numbers are positive integers (1, 2, 3, ...), and 12 is a natural number.
- Whole numbers include all natural numbers and zero (0, 1, 2, 3, ...), and 12 is a whole number.
- Integers include whole numbers and their negative counterparts (..., -3, -2, -1, 0, 1, 2, 3, ...), and 12 is an integer.
The other options do not fit all three categories.
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