What can be drawn safely from the case of Genie is that______.()

What can be drawn safely from the case of Genie is that______.()

A.it confirms the critical period hypothesis

B.human's language acquisition device is independent of other intellectual abilities

C.language can not be acquired at all after the critical period

D.the language faculty of an average human degenerates after the critical period and consequently, most linguistic skills cannot develop

正确答案是D