Which of the Following Is False About Planning a Speech

Which of the following is false about planning a speech?

A) For a persuasive speech,in addition to considering the audience's interests,you will also want to gauge their attitudes and beliefs.
B) For a short speech,especially if it is a speech to entertain,you may be able to rely completely on your knowledge and ideas.
C) In most cases you will need to gather information so that you can make your speech interesting by telling the audience things they do not already know.
D) When you have determined your general purpose,the amount of material appropriate to the time allowed for your speech,and the appropriateness for your audience,then you can identify the topic for your speech.
E) You should state your specific purpose in more than one sentence.