Answer:
Audience appeal is one approach to persuasion, or rhetorical strategy, in public speaking and presentation. There are several elements to overall audience appeal, which are generally also applied to writing strategies.
Explanation:
The technique that this sentence best illustrates is understatement.
Understatement means that you are not showing the full 'strength' of something, but it is rather understated - so here, the coach only said that 'he was glad' even though his team won the Super Bowl, which is a huge deal. So his emotions should have been way stronger.
