The answer that best explains why anger, as one of the primary emotions, can have positive consequences is C: "being angry at yourself for losing your key a third time makes you hang it on the kitchen hook from now on, so you always know where to find it."
This option illustrates how anger can serve as a motivator for change and improvement in behavior. The frustration from losing the keys prompts a proactive solution, leading to better organization and preventing future issues. This reflects how emotions can drive individuals to take constructive actions to avoid similar situations in the future.