13. In the first paragraph, the author describes the stillness of the Sargasso Sea as the Cramer passes through it primarily to emphasize that the stillness:
A. won’t last long, for the sea will become rough when the wind rises.
B. makes it easy for a passenger on the Cramer to spot oceanic islands that break the water’s surface.
C. is in dramatic contrast to the power of what exists on and under the seafloor far below.
D. makes it seem as if the Cramer’s wake is