Math 6

Question Analysis  
This question tests the result of operations on a larger natural number (2025), focusing on whether the outcome remains a natural number.  

Key Concept Explanation  
Natural numbers are closed under addition and multiplication with natural numbers.  
Subtraction or addition with negative numbers can yield non-natural results; division may yield non-integers.  

Step-by-Step Solution  
1. A. 2025 - 2026 = -1: Negative, not a natural number.  
2. B. 2025 ÷ 2 = 1012.5: Decimal, not a natural number.  
3. C. 2025 × 1 = 2025: Natural number (closure under multiplication).  
4. D. 2025 + (-2025) = 0: Zero, not a natural number.