Adjectives and Adverb phrases relate to prepositional phrases because if you remember what an adjective is, it describes a noun and then an adverb i believe can describe a verb, adjective, and other adverbs. Both adjective and adverb phrases contain prepositions, there fore relating them to prepositional phrases.... I hope this is what you were looking for and answered your question... :)
I hope this helps. If you have read the book just summarize what you have read. If not then use that website below and pick out things that summarize it.
http://allreaders.com/book-review-summary/shadowland-39059
It can be B)
hopefully it’s right