In his Back to School speech, what main argument does Barack Obama make?
A. You are unlikely to succeed if you don't like getting up early in the
morning every day.
B. The American people need you to take responsibility for your
success, and you should do it for yourself, too.
C. Very few people have the ability to achieve greatness, and those
who do work hard in school.
D. American adults pay high taxes and make a great deal of effort to
help kids get good training for life.