What Homeostatic Requirement Might Explain Why Discontinuous Breathing Is Only

What homeostatic requirement might explain why discontinuous breathing is only seen in resting insects?

A) Toxic levels of carbon dioxide can build up in active insects.
B) Resting insects have more metabolic activity.
C) Oxygen can build up in active insects.
D) Oxygen is used as quickly as it arrives in active insects.
E) Resting insects produce more carbon dioxide.