Answer:
The most appropriate delivery method for a valedictorian to deliver a speech at a graduation ceremony is typically a memorized speech.
Step-by-step explanation:
Memorizing the speech allows the valedictorian to maintain a strong connection with the audience by maintaining eye contact and appearing confident. It also ensures that the speech is well-rehearsed and flows smoothly, making it more engaging and impactful for the audience. While other methods, such as extemporaneous or manuscript, can be suitable for different types of speeches, a graduation speech is a formal and significant event, making a memorized speech the preferred choice.