The correct answer is D. A person should discover the truth on his or her own.
Step-by-step explanation:
In literature or narratives, it is common the author expresses different messages or believes about life through multiple elements including the character's values, actions, and words. In the case presented, there is a short dialogue between two characters the first one is Helmer who believes Nora is a wife and a mother and the second one is Nora who argues she is a "reasonable human being" and she emphasizes she would not believe or be content with people words or even with the information she found in book but instead she "must think over things ... and get to understand them". This shows the author of this literary work aims at showing a person should not read books or listen to other people to find what is true, but instead a person should find out the truth on his or her own, which is shown through the words and character of Nora.