A nurse is assessing a client's cranial nerves as part of a neurological examination. Which of the following actions should the nurse take to assess cranial nerve IlI?

A. Testing visual acuity: This assesses cranial nerve II (optic), not cranial nerve III. B. Eliciting the gag reflex: This assesses cranial nerve IX and X (glossopharyngeal and vagus), not cranial nerve III. C. Observing for facial symmetry: This assesses cranial nerve VII (facial nerve), not cranial nerve III. D. Checking the pupillary response to light: Cranial nerve III (oculomotor) is responsible for controlling pupil constriction in response to light, making this the correct method to assess cranial nerve III.