A number is divisible by 8 if the last three digits of the number form a number that is divisible by 8. Therefore, the correct answer is:

C. Zero or divisible by 8

If the last three digits of a number form a number that is divisible by 8, then the entire number is divisible by 8.

Would you like further details or have any questions? Here are five more questions you can ask:

1. What are the rules for divisibility by 3?
2. Can you explain the rule for divisibility by 4?
3. How do you determine if a number is divisible by 6?
4. What is the rule for divisibility by 9?
5. Can you provide examples of numbers divisible by 8?

Tip: Understanding divisibility rules can help quickly determine factors of a number and simplify arithmetic calculations.