How many distinct triangles can be drawn using three of the dots below as vertices?[asy]dot(origin^^(1,0)^^(2,0)^^(0,1)^^(1,1)^^(2,1));[/asy]<spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>12<spanclass=′latex−bold′>(C)</span>18<spanclass=′latex−bold′>(D)</span>20<spanclass=′latex−bold′>(E)</span>24