What is a key factor contributing to the development of delinquent behavior according to early trait theory?

The correct choice highlights that early trait theory emphasizes the significance of an individual's physical and psychological characteristics in the development of delinquent behavior. This theory posits that certain traits, such as genetic predispositions, biological factors, or neuropsychological conditions, can strongly influence an individual's likelihood to engage in delinquency. Early theorists like Cesare Lombroso argued that criminals could be distinguished by specific physical features, suggesting a biological basis for criminality.

In this context, while social learning, cultural influences, and economic status undoubtedly play roles in juvenile delinquency, they are more aligned with later theories that focus on environmental and social factors influencing behavior. Early trait theory, however, primarily attributes delinquent behavior to inherent or biological traits, making the physical makeup of offenders the key factor in this paradigm.