Dwayne is giving a speech on ronald reagan and intends to follow his life story from childhood until his death to structure his speech. which speech structure is dwayne using?

The correct answer here is chronological order.

There are numerous ways of organizing your speech and chronological is one of them and for presentation on a person, Ronald Reagen in this example, is a good choice. The chronological structure follows events as they have happened. So a story from a childhood to death is a an good example of a chronological structure.