When did one of the shop owners realize the boy was a fake （冒充的)charity lady ？ A

When did one of the shop owners realize the boy was a fake (冒充的)charity lady ？

A. When the boy’s phone rang.

B. When the boy was dressed as woman.

C. When the boy began swearing (骂人)

D. When the boy wanted to run away

请帮忙给出正确答案和分析，谢谢！