I don t know . A. where she comes from . B. how old is she C. When was she born ?

问题补充：

I don t know .

A. where she comes from . B. how old is she C. When was she born ?

答案：

解析：当宾语从句是特殊疑问词连接引导的宾语从句时，从句要用陈述句语序，而不能用疑问句顺序。故A 。