I think it's d I hope this helps
The book "Life on the Color Line" by Gregory Howard Williams is about a boy who spent his whole young life thinking he was white, and then learned that he is part black. The title refers to the fact that he is learning how to integrate into both societies, both races.
A verbal phrase that functions in a sentence only as an adjective is a 3. participle. For example: He uses a walking stick. - the word <em>walking </em>is a participle used as an adjective here.
A gerund can only be used as a noun, not adjective, a pronoun is only a pronoun, and an infinitive is not used as an adjective.
Base on my research and further understanding about the said topic, I would say that every structure of a poem may have a figurative speech and also flowery words that allows the reader to feel the emotion of the said poem. I hope you are satisfied with my answer and feel free to ask for more