Which of the Following Audience Members Is Being Rude to the Presenter

Which of the following audience members is being rude to the presenter?

A) Ginni smiles when she agrees with the speaker.
B) Nell sits up straight and wears an alert expression.
C) Cheever nods slightly as he reads the presentation slides.
D) Ayesha watches the speaker except when she jots down important notes.
E) Bill sends text messages during most of the presentation.