One reason not to be nervous when giving a speech is that

Question $5$ options:

much, if not most, of your nervousness goes undetected by the audience.

nervousness suggests that you have little idea what you are talking about.

some people in the audience are probably even worse at public speaking than you.

nervousness is never a good thing because it is an indication that you don't care about delivering a quality speech.

your topic probably isn't important enough to your audience for them to care.