What is this news item mainly about？A．New findings of the reason for sudden infant death.B

What is this news item mainly about？

A．New findings of the reason for sudden infant death.

B．New methods to prevent sudden infant death.

C．The mystery of sudden infant death.

D．The relationship between sudden infant death and modern medicine.

请帮忙给出正确答案和分析，谢谢！

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