One side of a given triangle is 18 inches. Inside the triangle a line segment is drawn parallel to this side forming a trapezoid whose area is one-third of that of the triangle. The length of this segment, in inches, is:
<spanclass=′latex−bold′>(A)</span>66<spanclass=′latex−bold′>(B)</span>92<spanclass=′latex−bold′>(C)</span>12<spanclass=′latex−bold′>(D)</span>63<spanclass=′latex−bold′>(E)</span>9