निम्नलिखित में से कौन सी अवधारणा आमतौर पर प्रारंभिक बाल्यकाल के दौरान विकसित नहीं होती है?

According to Piaget, the stage in which children develop object permanence is:

Kohlberg's highest stage of moral development is characterized by:

Which of the following behaviors in early childhood would MOST strongly indicate a need for developmental screening for Intellectual and Developmental Disabilities (IDD)?