<span>3-The narrator has plotted his revenge in secret</span>
The underlined word of the sentence which "conclusive" would have a denotation of "impossible to disprove" as it is used in the sentence. Furthermore, a denotation is the "literal" meaning of a word or some may refer to it as the "dictionary definition or meaning."
The book twilight by Stephanie Meyer
Meyer, Stephenie, and Young Kim. Twilight. London: Atom, 2009. Print.
This is a compound sentence because you can break it into two sentences.
Hope this helps