When positive integer N is divided by 7, the remainder is 3. What is the remainder when 3N is divided by 7?

✓ Correct Answer: Option C

If N divided by 7 leaves a remainder of 3, N can be written as 7k + 3. Then 3N = 3(7k + 3) = 21k + 9. Since 21k is divisible by 7, the remainder of 3N is the remainder of 9 when divided by 7, which is 2.