Theorists believe that people are motivated by a need to have relationships with others and that severe problems in the relationships between children and their caregivers may lead to abnormal development.

A. Ego
B. Self
C. Behavioral
D. Object relations

D. Object relation.

Explanation: Object relation theory is a part of psychoanalytic theory which attempts to explain the importance of interpersonal relationship particularly between closely related members such as mother and child helps shapes and motivate the behavior of an individual particularly from childhood. It argues that the relationship between mother and child goes a long way in shaping the behavior and personality of the child later in life and thus a breakdown in relationships could result in abnormal development.