If N is an integer and N leaves a remainder of 3 when divided by 5, which of the following expressions must be a multiple of 5?

✓ Correct Answer: Option B

If N leaves a remainder of 3 when divided by 5, N can be written as 5k + 3. Adding 2 to N gives 5k + 3 + 2 = 5k + 5 = 5(k+1), which is always a multiple of 5.