What type of appeal is used when Spike threatens Chris with "I'll give you five, and they're all knuckles"?

The correct answer is the Appeal to Ridicule. This type of appeal is characterized by the use of mockery, contempt, or intimidation to discredit an opponent or to build a particular point. In the statement "I'll give you five, and they're all knuckles," Spike is effectively using a threat laced with ridicule to belittle Chris and assert dominance, suggesting that any response from Chris would lead to violence.

The aggressive and mocking nature of the statement implies that Spike believes he holds power over Chris, thus creating an emotional response based on fear and intimidation rather than logical argumentation. This is illustrative of how ridicule can be used to influence behavior or thoughts, especially in confrontational situations.