A teenager sustains a severe closed head injury following an all-terrain vehicle (ATV) accident and ...

ANS: D
Stupor is a condition of deep sleep or unresponsiveness from which a person may be aroused or caused to open his or her eyes only by vigorous and repeated stimulation. Confusion is the loss of the ability to think rapidly and clearly and is characterized by impaired judgment and decision making. Coma is a condition in which there is no verbal response to the external environment or to any stimuli; noxious stimuli such as deep pain or suctioning do not yield motor movement. Obtundation is a mild-to-moderate reduction in arousal (awakeness) with limited response to the environment.