While Searching for a Speech Topic, Charlie Writes Down the Broad

Multiple Choice

While searching for a speech topic, Charlie writes down the broad subject area of "health issues" and lists several topics that he finds interesting under this heading. Charlie continues until he's narrowed this subject to one specific topic, "eating a plant-based diet for heart health." What technique for finding a topic is Charlie using?

A) conducting an Internet search
B) engaging with social media
C) self-inventory
D) brainstorming