Answer:
a) students' rights to free speech
Step-by-step explanation:
in 1969, John and Mary Beth tinker, along with some of their siblings and friends, wore black armbands to various Des Moines independent community school did trick schools to protest the Vietnam war , and were suspended over it, and the tinkers sued the school district; the case went all the way to the Supreme Court, where the case was ruled in favor of the tinkers