If \(r\) and \(s\) are integers, is \(r+s\) divisible by \(3?\)

[Gmat_mission]

If \(r\) and \(s\) are integers, is \(r+s\) divisible by \(3?\)

(1) \(s\) is divisible by \(3.\)
(2) \(r\) is not divisible by \(3.\)

Answer: C

Source: GMAT Prep