I would have to say black, because it just fits with most creepy books. Sorry if you can't figure out an explanation.
Rhetoric usually works through the emotive, or rhetorical force of words and phrases<span>—the emotional associations they express and elicit. Rhetoric is used to influence our beliefs and attitudes. In fact, rhetoric can be more effective than argument when it comes to influencing someone’s belief’s and attitudes. But it shouldn’t be. Rhetoric may be psychologically powerful, but by itself it establishes nothing.</span>
One issue revolving child exploitation is the use of marketing fast food restaurants towards children. It uses them to gain wealth.
Its the second one, a valley! Hope this helps :)