Which of the following best describes "extemporaneous" speech?

The term "extemporaneous" speech refers specifically to speaking that is performed without advance preparation or a script. This style of speaking allows the speaker to engage more directly with the audience, adapting their delivery and content based on immediate feedback or the context of the conversation.

In an extemporaneous speech, the speaker typically relies on a strong knowledge base of the topic, allowing them to articulate their points fluidly and spontaneously. This characteristic distinguishes it from planned and scripted speeches, which require meticulous preparation and limit the opportunity for real-time interaction. Similarly, creating from written notes or reading from a teleprompter involves a degree of pre-planning, which does not align with the essence of extemporaneous delivery. Thus, the option that describes extemporaneous speech accurately emphasizes its nature of spontaneity and lack of prior arrangement.