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The past participle of the word endorse is endorsed.
The past participle of a verb is a verb ending in ed and it acts as an adjective or adverb.
So to get the past participle of endorse simply add ed.
I think it is D
Hope this help you
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<span>. 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.</span>