Given the equations x2+kx+6=0 and x2−kx+6=0. If, when the roots of the equation are suitably listed, each root of the second equation is 5 more than the corresponding root of the first equation, then k equals:<spanclass=′latex−bold′>(A)</span>5<spanclass=′latex−bold′>(B)</span>−5<spanclass=′latex−bold′>(C)</span>7<spanclass=′latex−bold′>(D)</span>−7<spanclass=′latex−bold′>(E)</span>none of these