Grandparents are using A) positive reinforcement on her.
When a behavior is followed by the introduction of a pleasing or desirable stimulus, this is known as positive reinforcement. The desirable stimulus reinforces the behavior, increasing the likelihood that it will happen again.
It is a positive parenting approach that is employed for a variety of goals and in a wide range of circumstances because it builds on the positive behaviors that have already been shown and rewards the person you are trying to train's innate propensities for good behavior.
The foundation of Skinner's operant conditioning theory is the idea that the best approach to comprehend and control a behavior is to look at its causes and effects.
To know more about positive reinforcement:
https://brainly.com/question/14838159
#SPJ4