Which sentence best expresses the central argument of President Barack Obama’s back to school speech

A. It is your responsibility to yourself and to the United States to work hard in school

B. People who get out of bed before school to study have a greater chance at a successful career

C. Hardly anyone achieves amazing successes in life, so you must start now if you want to be one of the lucky few

D. Hardworking parents and teachers are the foundation of the American public education system