Math 6

Question Analysis  
This question assesses the ability to identify a set of natural numbers by excluding non-natural elements (decimals, negatives, zero) among larger integers.  

Key Concept Explanation  
Natural numbers are positive integers ≥1. A valid set must exclude zero, negative numbers, and non-integers.  

Step-by-Step Solution  
1. Option A: Contains 3.5 (decimal). Invalid.  
2. Option B: Contains -500 (negative). Invalid.  
3. Option C: All elements (900, 1001, 1111, 1234) are positive integers. Valid.  
4. Option D: Contains 0. Invalid.  

Common Mistak...