_____ with the question the students raised, the teacher paused for a few seconds.[ ]

A. Puzzling    

B. To puzzle        

C. Puzzled        

D. Being puzzled

读某地岩层剖面图（下图），回答下列各题。

图甲中P岩石类型可能为（）

A.侵入岩

B.喷出岩

C.沉积岩

D.变质岩