When thinking about the format of a presentation, the most important thing to remember is that
1.) pictures overshadow the information
2.) people cannot read unclear sentences
3.) humor should be used at all times
4.) colorful fonts always hold peoples attention.

When thinking about the format of a presentation, the most Important thing to remember is that 2. people cannot read unclear sentences

It is highly important because the message you are trying to get across in your presentation, will not be brought across due to the unclearness of your presentation. So yes, this is the most important answer.

2.) people cannot read unclear sentences

Explanation:

Making presentations is for some a necessary evil, for others a nightmare. The reality is that both in the educational and work environment this tool is almost ubiquitous and it is essential to know how to use it. To make a good presentation it is necessary to take into account many factors, the images that will be used, the background colors, the colors of the letters and the sentences that we will use. It is of the utmost importance that the sentences are clear and precise, so that they convey the desired message.