Final answer:
Sally taking aspirin to remove a headache is an example of Negative Reinforcement, which involves the removal of an undesirable stimulus to increase a behavior.
Step-by-step explanation:
Sally takes two aspirin to remove a headache. This is an example of Negative Reinforcement. In operant conditioning, negative reinforcement occurs when an undesirable stimulus is removed to increase a behavior. For Sally, the headache is the negative stimulus and by taking aspirin, she is removing that stimulus, thus increasing the likelihood that she'll take aspirin again in the future to alleviate a headache. It's important to note that this is different from punishment, which aims to decrease a behavior. An example of negative reinforcement from everyday life is a car seatbelt alarm that stops beeping when you fasten the seatbelt, encouraging this safety behavior.