Final answer:
Impulsivity in mania associated with bipolar disorder poses the greatest risk for injury due to potential engagement in risky behaviors without considering consequences.
Step-by-step explanation:
Among the symptoms of mania in bipolar disorder, it is impulsivity that places a patient at the greatest risk for injury. Hyperactivity, elevated mood, and racing thoughts, while concerning, do not directly lead to risky behaviors with the same likelihood as impulsivity does. Patients experiencing impulsivity may act without considering the consequences of their actions, which can result in harm to themselves or others, and may engage in dangerous activities. It's important to manage mania and its symptoms effectively to reduce the risk of injury.