Three minutes later, more than ten policemen turned up at the spotthe accident happened. A

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A. which
B. what
(答案→)C. where
D. that
解析：选C。考查定语从句。分析句子成分可知, 此处spot应为先行词, 使用where引导定语从句, where在从句中作状语, 表示地点。
【知识拓展】模糊先行词后的定语从句
①当先行词为case, condition, situation, position, point, stage, circumstance, play, job, work, scene, spot, activity, process等名词时, 若在从句中充当状语成分, 可用where引导; 若作主语、宾语等成分, 可用that/which引导定语从句。
②occasion, point, stage等名词表示时间节点的时候, 其后的定语从句可用when引导, 在从句中作时间状语。