Respuesta :
Answer is A, because the subject of the sentence, "Eleanor and Emma" is plural and should be matched with a plural pronoun--"their" instead of "her." The sentence should read, "Eleanor and Emma showed us their new dresses."
Answer: A) Eleanor and Emma showed us her new dresses.
Pronoun-antecedent agreement refers to the rule that a pronoun must match its antecedent (the word it is referring to) in gender and number. In the case of sentence A, this is not being respected. The subject of the sentence is plural "Eleanor and Emma." However, the pronoun is written in a singular form ("her").