Why Do Presentation Aids Improve Learning

Why do presentation aids improve learning?

A) Most people prefer information conveyed via audio-visual means over information conveyed via speaking.
B) Most people comprehend better if more than one of their senses is engaged.
C) Most people will not fully comprehend a speech unless it is accompanied by visual aids.
D) Most people learn better when they have presentation aids to distract them from the speaker.
E) Most people will become bored during a speech and stop paying attention unless there are presentation aids.