A presenter is preparing to deliver a presentation at an annual conference. Over 200 people are expected to attend this presentation. Which of the following is the least effective technique for making a lasting impression on the audience?
A)Open with a joke.
B)Focus on the audience's interests.
C)Describe the topic in human terms.
D)Use specific numbers, dollars, or percentages.

Presentation is delivering and presenting of speech in front of audience by presenter.Ideas, content and thoughts are demonstrated and shared through medium of presentation.

A good presentation can be presented through organizing the ideas, confidence while delivering speech, notes creation, strong opening etc,

Opening a presentation with joke is not appropriate and formal way for starting a presentation. It will not create impressive effect on the audience.

Other options can be used during the speech because concentrating on audience's liking,describing subjects and using parameters can positively influence the presentation.

Thus, the correct option is option(A).