Who are the subjects of the research on the influence of milk powder?A.Mothers who bottle-

Who are the subjects of the research on the influence of milk powder？

A．Mothers who bottle-feed their babies.

B．Workers in milk power plants and office workers.

C．Nannies and bakers who often handle milk powder.

D．Blue-collar workers who have asthma.

请帮忙给出正确答案和分析，谢谢！

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