中国手语中“ 我”、“你”、“他”属于（ ）造词类型"I "," you" and "he" in Chinese sign language belong to word-formation (     ).
A、 转注类手语词 annotated sign language word
B、 指示类手语词demonstrative sign language word
C、会意类手语词 indicative sign language word  
D、组合类手语词combinatorial sign language word