I would say social satire... But since it says novel at the end of the sentence that would sound a bit strange...
The adjective undefiled means <em>pure</em>, <em>immaculate</em>.
The words in this sentence which help the readers infer the meaning of this word are the words <em>pure </em>and <em>genuine</em>, because they are synonymous with the word <em>undefiled</em>. The writer uses these two synonyms to describe the sources and the diction which links to the writers before restoration.
When you talk about "Wave" Dale characterizes water as an element that gives life. Some people can think it is giving and taking life, but the correct option in here is A. gives life. Hope this can help