Final answer:
The strategy for behavioral change that involves the decline of undesired behavior due to a lack of positive reinforcement is called extinction.
Step-by-step explanation:
The strategy for behavioral change that suggests that undesired behavior will decline as a result of a lack of positive reinforcement is known as extinction. Extinction occurs in operant conditioning when the behavior no longer receives the reinforcement that was previously maintained it. It is a process that leads to a decrease in the conditioned response when the reinforcer is no longer paired with the behavior. This concept differs from negative reinforcement, where an undesirable stimulus is removed to increase a behavior, and from positive reinforcement, where a desirable stimulus is added to increase a behavior. Extinction essentially means that the reinforcement maintaining a behavior is withheld, leading to the behavior's reduction over time.