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❓ 题目 According to the passage, why is the marginal value of an ecosystem service more important than its total value for policy decisions?

A. A. Because total value is difficult to calculate accurately, while marginal value can be measured precisely.
B. B. Because marginal value reflects the actual change in benefits from a small alteration, which helps assess the impact of land-use changes.
C. C. Because total value is infinite, making it useless for any practical comparison.
D. D. Because marginal value remains constant regardless of the scarcity of the service.

B. Because marginal value reflects the actual change in benefits from a small alteration, which helps assess the impact of land-use changes.