According to this excerpt from the ruling in the Supreme Court case Tinker v. Des Moines (1969), what is one reason the court ruled in favor of the students who wore black armbands?

A.
The students did not cause a disruption to learning by wearing armbands.
B.
Other types of political protests had been permitted at the school in the past.
C.
The protesters did not verbally express their opinions about the Vietnam War.
D.
Public schools do not have the right to limit students’ freedom of expression.