⑵ Which one is not the possible reason for the fact that more discipline issues such as violence and drugs in public schools than those in private schools?
选项：

A:Public schools are required to take every student who lives in their district and not to remove any student from the school.;
B:Private schools tend to have more parental support.;
C:A private school can end their relationship with a student who continuously refuses to follow their expected policies and procedures.;
D:Public schools cannot punish the students who break the rules of the school.