❓ 题目 According to the passage, what is a primary reason for the controversy over formally defining the Anthropocene?
- A. A) The lack of any human-induced markers in geological records.
- B. B) The difficulty in identifying a single, clear starting point for human impact.
- C. C) The rejection of the idea that humans have altered the environment at all.
- D. D) The absence of scientific evidence for the 'Great Acceleration'.