Hello. You did not provide the passage to which the question refers, which makes it impossible for me to give you an exact answer, but to help you, I will show you how to find the subject of a passage, which will guide you to the right answer.
The details of an excerpt are the phrases that support the main theme of the excerpt. For that, you will have to read the entire text and interpret the subject that is presented in this excerpt. Those subject is the answer to your question.
For example, if the excerpt shows confusing rules when the character questions the insasatex and unbelief of those rules, it means that the theme is "The rules of life do not always make sense".
