How many positive integers n are there such that n+n+n+n is an integer?<spanclass=′latex−bold′>(A)</span>1<spanclass=′latex−bold′>(B)</span>2<spanclass=′latex−bold′>(C)</span>3<spanclass=′latex−bold′>(D)</span>Infinitely many<spanclass=′latex−bold′>(E)</span>None of the above