Answer:
This change in the parent's behavior is an example of negative reinforcement
Step-by-step explanation:
Negative reinforcement is a term described by B. F. Skinner in his theory of operant conditioning. In negative reinforcement, a response or behavior is strengthened by stopping, removing, or avoiding a negative outcome or aversive stimulus.
Here the parent gives in (behaviour) to the child's tantrum (aversive stimulus)