I think it’s a because most of the time the main idea is in the first paragraph
Answer:
Open-Ended Questions. ...
Give Responsible Tasks. ...
Work in Groups. ...
Positive Competition. ...
Evaluation Programs.
Switch Roles. ...
Motivational Quotes. ...
Field Trips.
The author is trying to portray that all parts are important even though some may come smaller or larger than other. Nothing could happen as planned without the smaller of bigger parts