❓ 题目 According to the passage, what is the primary reason for the ongoing debate over the Anthropocene's boundary?
- A. A. The lack of any geological markers for human impact
- B. B. The disagreement over whether the onset was synchronous or gradual
- C. C. The rejection of the concept by the International Commission on Stratigraphy
- D. D. The absence of societal implications in geological classification