Which specifier of Delirium is marked by a heightened level of energy and agitation?

The correct choice, which indicates a heightened level of energy and agitation in the context of delirium, is hyperactive. Individuals experiencing hyperactive delirium often display increased motor activity, restlessness, and may engage in behaviors that reflect agitation. This state is characterized by a surge in activity levels, which can include fidgeting, excessive talking, or other forms of physical movement that are more pronounced than what is typical in other forms of delirium.

On the other hand, hypoactive delirium is characterized by decreased motor activity, lethargy, and apathy, and does not align with the symptoms described in the question. The mixed specifier refers to episodes that fluctuate between hyperactive and hypoactive states, lacking a consistent pattern of agitation, while the substance-induced specifier highlights delirium resulting from intoxication or withdrawal from substances, without specifically addressing levels of energy or agitation. Thus, the defining trait of hyperactive delirium makes it the appropriate selection in this scenario.