The correct options are
A They are discriminated by their teachers.
B Families are too poor and unable to bear the cost of educating all their children.
D Lack of proper schools and teachers to teach on a regular basis in rural areas.
Census information is used to measure many things, like the number of literate people, and the ratio of men and women, et cetra. It reflects that children belonging Dalit, Adivasi and Muslim communities drop out of school earlier compared to others.
On further investigation into the subject it is found that children belonging to these communities are discriminated by their teachers, parents are unable to bear the cost of educating all their children and lack of proper schools in rural areas.