Final answer:
The key factor in predicting whether rejected children will engage in delinquent behavior is their social environment.
Step-by-step explanation:
Research has shown that children who grow up in impoverished areas and neighborhoods with high levels of crime and disorganization are more likely to engage in deviant or criminal behaviors. This is because the social environment plays a significant role in shaping an individual's attitudes, values, and behavior.
For example, social disorganization theory suggests that individuals who grow up in impoverished areas with limited resources and social support systems may be more prone to delinquency due to a lack of positive role models, limited opportunities for legitimate success, and a higher prevalence of criminal influences.