One of the symptoms of post-traumatic stress disorder is:

Substance abuse is a common symptom associated with post-traumatic stress disorder (PTSD). Individuals coping with PTSD often experience intense emotional distress and may turn to drugs or alcohol as a way to manage their symptoms or numb their feelings. This coping mechanism can lead to dependency and further complicate their mental health, resulting in a cycle of abuse and heightened psychological issues.

In contrast, enhanced problem-solving skills and increased energy levels are not symptoms related to PTSD. These characteristics do not align with the experiences of individuals suffering from this disorder. Social withdrawal, while a relevant behavioral change, is more a result of the emotional strains of PTSD rather than a suitable primary symptom among these options. Thus, substance abuse stands out as a significant and recognized concern for those dealing with the aftermath of traumatic experiences.