What happens during breathing? A. The chest rises, the diaphragm curves upward, air rushes out. The chest moves downward, the diaphragm flattens, air rushes in B. the chest rises, the diaphragm curves upward, air rushes in, the chest moves downward, the diaphragm flattens, air rushes out C. the chest rises, the diaphragm flattens, air rushes out. the chest moves downward, the diaphragm curves upward, air rushes in D. the chest rises diaphragm curves upward, air rushes out.​