The sentence which has a pronoun in the objective case is “ My father took me to the Library of Congress.” It contains the objective (or accusative) form of English pronoun “me.”
In English grammar, an objective or accusative case is the case where a pronoun functions as one of the following:
1) the object of a preposition 2) the direct or indirect object of a verb or verbal 3) an appositive to an object or 4) the subject of an infinitive