In addition to a claim, which is needed to create an effective written or spoken message?

A. Emotional conclusions

B. References to history

C. Very lengthy sentences

D. Well-organized support

The correct answer would be D. In addition to a claim, a well-organized support that is needed to be able to create and effective written or spoken message. When the ideas in a message are organized well, the audience would understand more the idea and what you are trying to relay.