❓ 문제 According to the passage, which of the following is a reason why some scientists oppose the formal recognition of the Anthropocene as a geological epoch?
- A. The markers of human impact are not consistent across different regions at the same time.
- B. The concept was popularized by a non-geologist, Paul Crutzen.
- C. Radioactive isotopes are not considered a valid stratigraphic marker.
- D. The term has already been rejected by the International Commission on Stratigraphy.