The definition of a glossary i found is: an alphabetical list of terms or words found in or relating to a specific subject, text, or dialect, with explanations. Based on this definition i would think the most likely answer would be B, a list of topics in a book.
Ok
20 word limit sucks, so I’ll just say that I hope you’re doing okay. Stay safe out there, bro.
This is a bit subjective because this particular work is difficult to classify, but in general many would agree that it is a thematic work of documentation.
