A.Don't be sad. I will look after him.

B.Don't worry. I will take care of him.

C.Don't worry. I will see him.

【答案】B

【解析】

A不要悲伤，我会照顾他。B不要担心，我会照顾他。C不要担心，我会看到他。B符合题意。故选B。