Its the book "My Father Writes To My Mother"

The author senses the ____ of the union of a man and a woman.  

shame
mystery
importance
requirement

I've read the story myself, and I still can't tell what the answer is. To me, I think it's either shame or importance. Shame because at the time and place it was shameful to openly declare love between a man and woman. Importance, because, well..Obviously it's important for a man and women to unite. It's a big milestone. So I don't know, but I would choose one of those two.

Actually, it's "mystery". Just took the assessment.

To determine the answer, you should analyze the book "My Father Writes To My Mother" by considering the context and themes presented in the story. Look for passages or themes that explore and discuss the union of a man and a woman. As an AI, I don't have access to specific books or their content, so I cannot provide a direct answer for this particular book. However, I can guide you on how to approach finding the answer within the book itself. Look for passages where the author discusses the emotions, perceptions, or attitudes towards the union of a man and woman. Observe the language or actions used by the author to convey their thoughts on this topic. By critically examining the book's content, you will find clues that can help you determine whether the author senses shame, mystery, importance, or requirement regarding the union of a man and a woman.

I'll be glad to comment on your answer.