The answer to the question above is "C) Precedent" which is the kind of reasoning that Justice Fortas uses to support his argument when he refers to Keyishian v Board of Regents in the majority opinion for Tinker v Des Moines. The precedent is the kind of reasoning which a person uses by using legal aspect support. Abe Fortas is a man with a law background. Thus, precedent is the most likely kind of reasoning he uses.
