Which of the following statements, if true, would constitute the strongest evidence in support of the proposal described above? A. The level of technology achieved by our ancestors who designed and built the monuments in question was actually much higher than it was formerly believed to be. B. Monuments such as the pyramids of Egypt are very often positioned so that their prominent design features point to heavenly bodies. C. Stories about beings from heaven appear in the mythologies of cultures that could have had no interchange with one another. D. Modern builders cannot conceive of a way to duplicate the monuments without resorting to the most recent technological innovations. E. Any extraterrestrial civilization advanced enough to have interplanetary space travel during the time of our ancestors could easily find means of communicating with them.