Near the beginning of his speech Nathanael says, "Today, I'll be discussing the formation of the 54th Massachusetts, the racial difficulties they faced, and the Battle of Fort Wagner." What element of the introduction is he attempting to fulfill?

a.Stating his thesis.
b.Presenting the specific purpose of his speech.
c.Previewing the main points of his speech.
d.Establishing his credibility.
e.Providing an engaging introduction.