Each third-grade classroom at Pearl Creek Elementary has 18 students and 2 pet rabbits. How many more students than rabbits are there in all 4 of the third-grade classrooms?<spanclass=′latex−bold′>(A)</span>48<spanclass=′latex−bold′>(B)</span>56<spanclass=′latex−bold′>(C)</span>64<spanclass=′latex−bold′>(D)</span>72<spanclass=′latex−bold′>(E)</span>80