The visual examination of the nasal passages is:

A) bronchoscopy.
B) laryngoscopy.
C) rhinoscopy.
D) culture.

Rhinoscopy is the visual examination of the nasal passages, while bronchoscopy is the visual examination of the air passages leading into the lungs and is more invasive. Laryngoscopy is the visual examination of the larynx, or voice box. Culture is a laboratory test to identify bacteria, viruses, or fungi that may be causing an infection. Therefore, the best choice for visual examination of the nasal passages is rhinoscopy (Choice C).