I would say C because this passage talks about green building and how it's beneficial. Sentence 4 mentions about what the green roofs are made of and I don't think that would be necessary to include in this passage.
Explanation:
intransitive verb................
Explanation: A writer should always include a works cited page because you don’t want to be called out on plagiarizing. If you have quotes or information from a website, book, article, or any source you used then you need to give credit to that person/people because you didn’t come up with the information yourself.