Math 6

Question Analysis
This question tests the intersection of natural numbers, whole numbers, and integers.
The main focus is identifying numbers that fit all three definitions.

Key Concept Explanation
A number must be a positive whole number (no fractions or decimals) to be a natural number.
Since whole numbers include natural numbers and 0, any natural number is also a whole number.
Integers include all whole numbers (positive, zero, negative), so natural numbers are a subset of integers.

Step-by-Step Solution
Option A (0): Not a natural number (natural numbers start at 1), so it cannot belong to all three sets.
Option B (-3): Not a natural number or whole number (both sets exclude negative numbers), so it is incorrect.
Option C (5): A natural number (counting number), a whole number (includes 0 and naturals), and a...