Final answer:
The priority data for the nurse to collect to detect a change in the client's neurologic status is pupil size and reaction to light.
Step-by-step explanation:
The priority data for the nurse to collect to detect a change in the client's neurologic status would be pupil size and reaction to light. The size and reaction of the pupils can provide important information about the client's brain function and potential signs of neurologic impairment. Changes in pupil size or unequal reactions to light could indicate increased intracranial pressure or other neurologic issues. Therefore, monitoring the client's pupil size and reaction to light is crucial in assessing their neurologic status.