While giving a presentation, a person shoulda) revise and edit the speech. b) time the speech in advance. c) speak loudly and clearly. d) practice using media.

While giving a speech a person should do all of those options. 
A, B,C, and D all work but since the wording seems to be present I will say the answer is C.

Hey!

The best way to solve this equation would be to use the process of elimination. Let's get started!

Okay so the question clearly want us to fill in the blank with the options it provides. So let's go through those options one by one.

OPTION #1

"While giving a presentation, a person should revise and edit the speech."

Hmmm... This option does not seem like it could be a correct answer to me. When giving a presentation, you want to make sure you already edited it and rehearsed presenting it to an audience. If you had already done that, there should be no reason why you are revising and editing your speech during the presentation.

OPTION #2 

"While giving a presentation, a person should time the speech in advance."

I have been to a fair share of presentation where people time themselves before they begin their presentation. Let me tell you, this should not be done. When giving a presentation you should not be focused on setting a timer or worrying about a timer in general. Doing this will show that you did not rehearse for your presentation. This is something that should be done during your practice time.

OPTION #3

"While giving a presentation, a person should speak loudly and clearly."

This is something that should definitely be done. No matter how small your audience is you should always project your voice during your presentation. This is something you could practice while rehearsing, but it is something you MUST do when giving a presentation.

OPTION #4

"While giving a presentation, a person should practice using media."

I think not! A person should definitely not be practicing when giving there final presentation. This is something that must be done during rehearsal time. Doing this will make you look unprofessional, unprepared, and frankly it will make your audience uninterested.

Wow! Okay, now that we have gone through every single option given, we can clearly see that the answer to this question is the option that states  "speak loudly and clearly."

Hope this helps!

- Lindsey Frazier ♥