Antecedent is an expression that gives meaning to the word coming after that. For example, I was late to the meeting because police held me for speeding. In this sentence, pronoun me is an explained word which explain another pronoun - I. Antecedent has been used correctly in this sentence. In this question, the first option is correct. Antecedent has been used incorrectly in the second sentence because it's unclear who is considered with the pronoun he. The third option is also an incorrect antecedent because the explaining word has not been given.
Homer's world in The Odyssey looms large, and it presents symbols<span>, ranging from specific ... We take from this </span>passage<span> that Telemachus is almost ready to be king but ... The sea god answers the Cyclops' prayer by making </span>Odysseus<span>' struggle</span>
It is A, concrete detail, because it is the true that Dora the Explorer is on Nickelodeon. There is concrete evidence.