Self-disclosure is sharing personal feelings with others. So in other words the question is: does telling your partner your secrets/feelings strengthen your relationship?
Imagine if a couple never talked about feelings. What would their relationship be like? Strong or weak?
The answer is D, purpose. The writer wants the readers to feel a certain way, so I would think that answer choice D makes the most sense.
Kurt Vonnegut was an American writer. He was known for his dark and satirical novels. He published five novels before he was recognized in his novel, Slaughterhouse-Five. It then instantly became The New York Times Best Seller List after its release, which gained his success and fame, and received many awards and honors. After his death, he was hailed as one of the most important contemporary writers.