Bill walks 21 mile south, then 43 mile east, and finally 21 mile south. How many miles is he, in a direct line, from his starting point?<spanclass=′latex−bold′>(A)</span>1<spanclass=′latex−bold′>(B)</span>141<spanclass=′latex−bold′>(C)</span>121<spanclass=′latex−bold′>(D)</span>143<spanclass=′latex−bold′>(E)</span>2