Answer: Cognitive equilibrium
Explanation:
Cognitive equilibrium is defined as the state in which mental plan of person and its surrounding has certain balance and stability between them.Brain of the individual tends to understand the knowledge of their environment and world along with fitting in with new information.
According to the question, Jenny is encountering cognitive equilibrium as she understands the information about fruits in the form of apples or bananas and being introduced to the new information of pear makes her understand and fit-in in the environment.