An emergency medical technician is examining a trauma victim by shining a pen light into her patient's eye. She records the reactivity of the patient's pupils as they constrict when stimulated by the light. This test supports which of the following?
A) The patient has lost function of the optic nerve (II). B) The patient has function of the trochlear nerve (IV). C) The patient has suffered brain damage. D) The patient has function of the oculomotor nerve (III).