The author's argument that hot spots can be used to reconstruct the movement of continental plates is weakened by the fact that A. hot spots are never found at the boundaries of plates B. only extinct volcanoes remain after a plate moves over a hot spot C. lava flow patterns for all hot spots have not been shown to be the same D. the immobility or near immobility of hot spots has not been conclusively proven E. the changing configurations of islands make pinpointing the locations of hot spots difficult