问题：
[单选题]Since time is limited when you give a presentation, it is important to do the following while preparing the main body of your speech.
APractice in front of a friend to ensure you don’t make too many mistakes, thus wasting time.
BFigure out how many words are needed for the time limit, then write as much as you can about your topic.
CThink of a funny story to use as an example, then subtract parts if it is too long.
DIdentify the most important main ideas of your topic, organize them logically and present them in a concise manner.
