In Daryl's Speech on Football,he Tells the Audience in the Introduction

In Daryl's speech on football,he tells the audience in the introduction that he is going to discuss the history of the sport,some of the rules,and the benefits of playing football on cardiovascular fitness.What type of signpost is Daryl demonstrating?

A) A transition
B) An initial preview
C) An internal summary
D) A final summary
E) An external summary