❓ 题目 According to the passage, what is a primary reason why ecosystem services are often undervalued or ignored in economic decisions?
- A. A. They are typically provided free of charge by nature and lack market prices.
- B. B. Their economic value is generally too small to warrant consideration.
- C. C. They are only relevant to developing countries and not to industrialized ones.
- D. D. Scientists have not yet identified most of the services that ecosystems provide.