Answer: The sentence that does not contain an antecedent is "Adela and Geraldo went to the movies".
Explanation: An antecedent is the word or phrase that a pronoun refers to in a sentence. Although this pronoun is generally found after the antecedent, it can also come before the antecedent.<u> The only sentence among the options that does not include an antecedent is the first one</u> ("Adela and Geraldo went to the movies") since, unlike the other sentences,<u> it does not include any type of pronoun.</u>
An expository article is usually about explaining something or talking about it. So if it's a true story and you write it like a life story then yes it can be. If it's just a fictional story you want to write then no.