Answer: C.extinguished the behaviour
Step-by-step explanation:
Extinguished the behaviour:
What would help a person stop getting involved in a former conditioned behaviour?
Psychologist used the extinction method in which the conditioned response is slowly decreased until that conditioned behaviour is completely eliminated.
For example above the child is allowed to cry without parents or dentist's intervention and as no one intervened the child ended up stopping alone with no help so they have allowed the behaviour to get extinct .