reading/in/ my/ mother/ cooking/ the/ is/ am/ I/ my/ While/ kitchen/ in/ room/books/,//./

A. While I am reading books in the room, my mother is cooking 

B. While I am reading books in my kitchen, my mother is cooking 

C. While I am reading books in my room, my mother is cooking 

D. While I is reading books in my room, my mother am cooking