(单选题)
The participants were asked to ______.
A.design a personality questionnaire
B.hand in their commonly worn shoes
C.provide pictures of their shoes
D.look at pictures of different shoes
参考答案：C
参考解析：
细节理解题。根据第二段最后一句“Volunteers in the study were photographed in their most commonly worn shoes”可知，参与调查的人们需要提供他们最常穿的鞋子的图片。故选C。
知识点：
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