Which Best Describes the Treatment and Control Groups of the Abecedarian

Which best describes the treatment and control groups of the Abecedarian Project?

A) Children receiving early intervention services in school-based settings vs. those receiving them at home
B) Parents receiving consultation from a parent trainer vs. those provided readings on child development
C) Children receiving medical, nutritional, and social services vs. those who received the same plus early intervention
D) Teachers with special early childhood endorsements vs. those without special certification from their state boards of education