Answer:
Structure C is Trachea.
Step-by-step explanation:
A is epiglottis the flap present at the opening of the windpipe to prevent the food from entering in the wrong pipe, i.e. windpipe instead of the esophagus.
Structure C is the Trachea is the part of the windpipe that leads from the larynx to the bronchi
B is the larynx as it is present at the entry of the windpipe. It helps in the production of voice, when air passes through the larynx it makes the thin cartilages present there vibrate which leads to the production of sound
Structure F is Bronchi. Bronchi (or Bronchus singular) are the pipes that diverge from the windpipe into smaller pipes that end in sacks of alveoli.