What is the main point of President Barack Obama's Back to School speech?

A. People in the United States today all want to achieve greatness, but only a few will succeed.

B. Parents, teachers, and the government work hard and spend a great deal of money to educate children.

C. Nobody particularly likes getting up early in the morning, but people who don't will never succeed.

D. Students must take responsibility for their own education; this helps them personally and also helps their country.