What was the greatest difference between education during the Hellenistic period and education ...

What was the greatest difference between education during the Hellenistic period and education during the classical period?
 
  A) Rather than being a private enterprise, Hellenistic education became a duty of cities and their governments.
  B) Poor and middle-class Greeks alike were allowed to go to Hellenistic schools.
  C) The core curriculum became music and art rather than history, rhetoric, and philosophy.
  D) The elective system was first introduced, allowing students to choose the subject matter they preferred over any set, classical curriculum.
  E) Educational establishments were completely under the control of religious bodies and institutions.