When 18-month-old kayla was at her day-care center, she understood that her father would be picking her up at the end of the day. kayla's understanding that her father continues to exist even when he cannot directly be seen or heard demonstrates

Object Permanence

Explanation:

Object Permanence applies to the knowledge of the objects that they continue to exist even if they are unperceivable then. The theory of object permanence is a part of developmental psychology. The mental growth and capabilities of the younger children are addressed through this concept. In the above case, Kayla's ability to understand that her father exists and would return to her is because of object permanence.

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