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❓ 题目 What is the author's primary purpose in discussing the Catskills watershed example?

A. To illustrate a successful application of ecosystem service valuation in policy decisions
B. To argue that economic valuation is the only reliable method for environmental protection
C. To criticize New York City for prioritizing cost savings over environmental quality
D. To provide evidence that conservation is always cheaper than technological solutions

To illustrate a successful application of ecosystem service valuation in policy decisions