Bowen's family systems theory indicates that lack of differentiation can be shown through emotional overinvolvement, emotional distance, and reactive behavior in children. Each of these aspects reflects various difficulties in maintaining personal identity within family relationships. Thus, the correct answer is 'All of the above.' ;
Lack of differentiation in a family can manifest as emotional overinvolvement, emotional distance, and reactive behaviors in children. Each of these patterns reflects challenges in maintaining individual identities within emotional family connections. Therefore, the answer is 'D. All of the above.'
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