【单选题】【消耗次数：1】
斯坦福大学和加州大学伯克利分校的研究人员对GDP与气温变化关系的分析结论是，气温处于约（）时是经济增长的“黄金温度”。
①
A.13℃
②
B.15℃
③
C.17℃
④
D.21℃
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