DrJa Is Giving a Presentation at a Professional Research Conference,and

Dr.Ja is giving a presentation at a professional research conference,and the next day is discussing her presentation with her Psy 101 students.Dr.Ja uses one type of language - full of professional jargon and impressive-sounding words - during her conference presentation,but she removes this sort of advanced language when talking to her undergraduates.This is an example of __________.

A) audience design
B) the language acquisition device
C) style-shifting
D) the cooperative principle