I is the predicate pronoun. The predicate pronoun should also be able to be used as the Subject of the sentence if it was to be flipped at the linking verb. This sentence could also be written: Joe and I were the last arrivals. The subject complement renames the subject, so generally, the sentence should be able to be flipped like this. Option B has a pronoun but you can't flip the sentence. Lana and me were this year's soccer champions - wrong! This doesn't work which actually means the sentence is grammatically incorrect. In option C, I is a direct object. It receives the action of touched by the tribute. In option D, my is a possessive adjective/pronoun - not a predicate pronoun.
