You can find whatever you need at the shopping centre, is always busy at the weekend. A.

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A. that
B. where
C. what
(答案→)D. which
解析：首先主从句用逗号隔开，可以判断这是非限制性定语从句。还考查了关系代词和关系副词的区分， the shopping centre在定语从句中充当主语而不是地点状语，因而不应选择B项；而what不是引导定语从句的关系词，故选D。