❓ 题目 What is the primary reason that ecosystem services are often undervalued in traditional markets, according to the passage?
- A. A) They are difficult to measure due to their complexity.
- B. B) They are public goods, leading to market failure in pricing them.
- C. C) They are primarily cultural benefits that have no monetary value.
- D. D) They are only provided by ecosystems that are privately owned.