Derrick's Speech on Rodeos Focused on Three Different Events

Derrick's speech on rodeos focused on three different events.His central idea was "the modern rodeo has many interesting events including bronco busting,calf roping,and bull riding." Derrick's central idea could be readily broken down into main ideas based on

A) a chronological order or series of steps.
B) reasons to show the central idea is true.
C) logical division of the central idea.
D) the relative importance of each idea.