The scientists' argument depends on which of the following assumptions? A. The microorganisms brought up were of a species that is related to those previously known to science. B. No holes have been drilled into the Earth's surface to a distance deeper than 1.74 miles C. The microorganisms did not come from surface soil that came into contact with the drilling equipment. D. The stratum from which the samples came has been below the surface of the Earth ever since the Earth came into existence. E. The temperature at the bottom of the holes drilled was not significantly hotter than that of the hottest spots on the Earth's surface.