GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - I458ILE52C45L4E7M

According to the passage, it can most likely be inferred that iridium A. can be used by scientists to determine the duration of an event B. causes mass extinctions in a short period C. gathers excessively in clay deposits D. helps scientists determine the orientation of the magnetic field E. leads to inaccurate conclusions regarding the chronology of an event