According to Piaget's Cognitive Developmental Theory, if an infant searches for a hidden toy, Piaget assumed they had developed which of the following?

• A. Object permanence
• B. Conservation
• C. Egocentrism
• D. Reversibility

Answer: (A)

Verified step by step guidance

1. Understand the key concept in Piaget's Cognitive Developmental Theory related to infants searching for hidden objects, which is about their understanding of whether objects continue to exist when out of sight.
2. Recall that 'Object permanence' is the term Piaget used to describe the awareness that objects continue to exist even when they cannot be seen, heard, or touched.
3. Recognize that 'Conservation' refers to understanding that quantity remains the same despite changes in shape or appearance, which develops later in childhood.
4. Know that 'Egocentrism' is the difficulty in seeing the world from others' perspectives, typical in the preoperational stage, not infancy.
5. Understand that 'Reversibility' is the ability to mentally reverse actions, also developing after infancy, and is not related to searching for hidden objects.