❓ 문제 According to the passage, which of the following is a major criticism of payment for ecosystem services (PES) schemes?
- A. A. They are too expensive for developing countries to implement.
- B. B. They rely on valuation methods that can be biased by strategic responses.
- C. C. They prioritize cultural services over provisioning services.
- D. D. They fail to provide any economic incentives for landowners.