During swallowing,the glottis can be covered by a thin elastic cartilaginous flap called $A$ to prevent the entry of food into the larynx. The trachea is a straight tube extending up to the $B$ cavity,which divides at the level of the $5^{th}$ thoracic vertebra into right and left primary $C$. Choose the correct option for $A, B$,and $C$ from the given four options to complete the above statement with reference to the $NCERT$ textbook.

• A
  $A-$ epiglottis,$B-$ bronchi,$C-$ bronchioles
• B
  $A-$ epiglottis,$B-$ mid-thoracic,$C-$ bronchi
• C
  $A-$ epiglottis,$B-$ hind-thoracic,$C-$ bronchi
• D
  $A-$ epiglottis,$B-$ pre-thoracic,$C-$ bronchi