Which Statement Best Describes How to Use Colour in Presentations

Which statement best describes how to use colour in presentations to get the most positive response from your audience?

A) Use the same colour palette no matter the cultural make-up of your audience.
B) Dark backgrounds are always preferred.
C) Bold colours⎯blue, green, and purple⎯are best to highlight primary ideas.
D) Adjust the text colour in such a way that it provides low contrast, which will make it more readable