Which Statement About the Degree of Formality for a Presentation

Which statement about the degree of formality for a presentation is correct?

A) Presentations for small groups should be more formal than presentations for large audiences.
B) Your presentation should be less formal when you expect the audience to include individuals from other countries.
C) When you anticipate repeating a presentation, you should make the presentation more formal.
D) Routine topics require a more formal presentation.
E) Complex topics or proposals concerning critical issues require a more formal presentation.