In the sentence "Epilepsy is not a disease but a complex of symptoms.",the part that says a complex of symptoms, is that a independent clause, dependent clause, phrase, adjective?

i will try let me see what they are first

in the quotation from passage, connie willis states that literature is a way for authors from the past to communicate with readers of today. we can read their stories, books, and other texts to learn lessons about life. willis refers to these lessons as messages “from beyond the grave.” willis has a favorable viewpoint about the timelessness of literature.

b is the correct answer