Treat the number that is added to n like an additional remainder. Add it to the remainder of 4 and then divide by 5. If this yields a remainder of 2, then n+that number will yield a remainder of 2. For instance, for n + 3, add 3 to 4 and divide by 5. Since 7/5 yields a remainder of 2, n+3 will yield a remainder of 2. C is therefore correct. Or, choose a trial number for n and test the answer choices.