It can be inferred from the passage that had the scaglia rossa not exhibited a certain geological property then which of the following would most likely have been true? A. Walter Alvarez would not have used the distribution of foraminifera in limestone as the basis for a conjecture. B. Scientists would have been unable to determine a shift in the Earth's magnetic fields. C. The rocks would not have been of any immediate utility to scientists. D. Iridium still would have been used to substantiate a hypothesis regarding the extinction of dinosaurs. E. The gap in foraminifera fossil record would have served an immediate purpose.