The question is asking "Which of the following is a good tip to remember when making a presentation?" and there are the following options:
Vary your tone, pitch, and pace - this is the correct option, it provides some useful tips Rush when making a main point - this is not a good advice, as you would be making your listeners stressed
Do not correct mistakes - this is again a bad advice, if you don't correct your mistakes, your listeners will leave with a bad impression of your speech
Avoid practicing ahead of time - this is a very bad advice. Practice makes perfect!
