Though she was young,  she________her most time________the children in remote areas. [      ]

A. devotes; to teach  

B. devoted; to teach

C. devoted; to teaching  

D. is devoted; to teaching

新生儿时由于肝细胞对胆红素的分泌排泄功能不成熟而发生新生儿生理性黄疸。