❓ 質問 According to the passage, why do many geologists favor the mid-20th century as the start of the Anthropocene?
- A. A) Because agriculture had a negligible impact on Earth's systems.
- B. B) Because this period provides a clear and globally synchronous geological marker.
- C. C) Because early human activities were not well documented.
- D. D) Because the concept of the Anthropocene was first proposed then.