The passage suggests that Martinson believes which of the following about deep waters in the Antarctic region? A. They rise to the surface more quickly than they would if global warming were to occur. B. They store heat that will exacerbate the effects of increases in atmospheric temperatures. C. They would be likely to be significantly warmed by an increase in atmospheric temperatures. D. They would be more salty than they currently are if global warming were to occur. E. They are less likely to be stirred up when surface waters are intensely salty than when surface waters are relatively unsalty.