Small Insects May Take a Bubble of Air Underwater When

Multiple Choice

Small insects may take a bubble of air underwater when they dive.The bubble can serve as an air tank for some time because

A) as CO₂ increases, the bubble inflates.
B) as O₂ is consumed, air pressure in the bubble decreases.
C) as O₂ is consumed, more O₂ diffuses into the bubble.
D) the partial pressure of nitrogen remains constant.
E) for each O₂ molecule used, a CO₂ molecule replaces it.