Which of the Following Statements Is True of Intervention Efforts

Which of the following statements is true of intervention efforts to prevent school dropouts?

A) Involvement of families or community organizations has proved ineffective in interventions to prevent school dropouts.
B) Most successful intervention programs involve teaching students in classes of large sizes.
C) Identification and monitoring of high-risk students has proved to be ineffective in preventing school dropouts.
D) Most intervention efforts are usually not introduced until students are on the verge of dropping out.