After an injury, which of the following can be determined by examining the condition of a victim's pupils?

Correct Answer: Option D — Whether or not the brain is functioning properly.

Pupillary response is a vital neurological indicator. Unequal, dilated, or non-reactive pupils often signify increased intracranial pressure, head trauma, or severe shock. Assessing these signs allows the responder to gauge the severity of brain injury and prioritize the victim for urgent medical evacuation and specialized neurological care.