请选择ABC6Z3d2G,{ A: What is your father doing? B: He is talking _________ an old man.3@2f;U9D3M9a*u5b4Z,M4W)?
A. at3@2f;U9D3M9a*u5b4Z,M4W)?
B. to3@2f;U9D3M9a*u5b4Z,M4W)?
C. in3@2f;U9D3M9a*u5b4Z,M4W)?