Which of these is a good guideline to follow when designing a presentation slide show?

use dark backgrounds
avoid large type
avoid fancy fonts
use only one slide

Answer and explanation:

A good guideline to follow when designing a presentations slide show is C) avoid fancy fonts.

Slide shows are a way to make one's presentation more attractive to the audience. It is multi-sensory, that is, it appeals to more than one sense. While the lecturer talks, his speech is supported by pictures, videos, and texts which help the audience understand and memorize the information. Music and other audios can also be played. All those elements help make the process more interesting and appealing to the public.

When it comes to texts, the person designing the presentation must take the audience into consideration. Fonts that are too small or fancy will make it much more difficult for people to read. That might have the opposite effect from the one intended, preventing the audience from enjoying the presentation fully.

the underline word is basically like a prepositional phrase.