Jimmy’s behavior is being controlled by <u>negative reinforcement</u>.
Explanation:
Jimmy does not expect a reward after taking out the garbage. All he wants is to stop his uncle from nagging. This characterizes negative reinforcement, which is the type of reinforcement that happens when a behavior is strengthened by the desire to avoid or stop a negative outcome or aversive stimulus. Jimmy will be more likely to take out the garbage in the future (behavior) to avoid his uncle's constant requests (aversive stimulus).