Question

you hit the \off\ button on your alarm clock. the ending of that obnoxious sound acts as a (n):
positive reinforcer
unconditioned stimulus
negative reinforcer
negative punishment
positive punishment

Explanation:

Negative reinforcement involves removing an aversive stimulus (in this case, the obnoxious alarm sound) to increase the likelihood of a behavior (hitting the "off" button). Positive reinforcers add something pleasant. Unconditioned stimuli are stimuli that naturally trigger a response. Negative punishment removes something pleasant to decrease behavior. Positive punishment adds something unpleasant to decrease behavior.

Answer:

Negative reinforcer