The right answer is "D. There is precedent for schools limiting student expression."
In 1965, when Mary Beth Tinker was 13 years old, she wore a black armband to her junior high school to protest the Vietnam War. The school promptly suspended her, but her protest eventually led to a landmark Supreme Court case. In their verdict, the court vindicated Tinker by saying students do not “shed their constitutional rights to freedom of speech or expression at the schoolhouse gate.”
If there were a dissent (which is the act of disagreeing with an official policy, with an instituted power or with a collective decision), in this case the most important question would be that there is a precedent for schools limiting the expression of the student.