Describe the respiratory system of a cockroach.

• A
  It consists of a network of tracheae that open through $10$ pairs of small holes called spiracles.
• B
  It consists of a network of tracheae that open through $8$ pairs of small holes called spiracles.
• C
  It consists of a network of tracheae that open through $12$ pairs of small holes called spiracles.
• D
  It consists of a network of tracheae that open through $6$ pairs of small holes called spiracles.