
Passage: Studies have found that insects "breathe" through the stomatal system in their bodies. The stomata are connected to the trachea, and more and more layers of smaller and smaller pores are attached from top to bottom, thus sending oxygen to the whole body. At the current level of oxygen content in the atmosphere, the total length of the stomatal system has reached the limit; if the total length exceeds this limit, the oxygen supply capacity will be insufficient. Therefore, it can be judged that the amount of oxygen can determine the size of insects.
Question: Which of the followings, if true, best supports the above argument?
A. A.Studies of invertebrates in the ocean have also found that organisms are larger in colder and oxygen-rich water
B. B.During the Carboniferous period, the concentration of oxygen in the earth's atmosphere was as high as 35%, much higher than the current 21%. At that time, many giant insects lived on the earth, and the dragonfly wingspan was close to one meter
C. C.Small locusts cannot survive in an environment with low oxygen content, especially in an environment with an oxygen concentration of less than 15%, while adult locusts can survive in an environment with 2% oxygen content
D. D.In an environment with high oxygen content and high air pressure, the tested fruit flies lived to the fifth generation, and their body size increased by 20%
Answer: