Externally tangent circles with centers at points A and B have radii of lengths 5 and 3, respectively. A line externally tangent to both circles intersects ray AB at point C. What is BC?<spanclass=′latex−bold′>(A)</span>4<spanclass=′latex−bold′>(B)</span>4.8<spanclass=′latex−bold′>(C)</span>10.2<spanclass=′latex−bold′>(D)</span>12<spanclass=′latex−bold′>(E)</span>14.4