TOEFL Listening: TPO-TOEFL听力TPO - 9PA48Z_7U1C5HB0GR$

According to the professor, when might stratigraphy provide misleading information about a portable object? A. When the object has decomposed over time. B. When the object is older than the site at which it was found. C. When the object is found in the lowest soil layer of a site. D. When the object was broken during excavation.