❓ 質問 According to the passage, which of the following best explains the 'cascade model'?
- A. A) It argues that ecosystem services are independent of human intervention.
- B. B) It suggests that ecosystem benefits arise only when natural capital is combined with human inputs.
- C. C) It focuses solely on the monetary valuation of ecosystem services.
- D. D) It rejects the concept of existence value as a legitimate service.