The answer is A. Simple sentence. For this sentence to be complex it would need additional structure such as a dependent clause. For this sentence to be compound it would need two independent subjects and verbs. And for it to be a complex-compound it would need both of those things.
Answer:
A
Explanation:
A. is the only on that makes senses
where you get information or research for a topic based essay. Could be a website, book, or magazine.