According to this passage, the sea _________ is likely to have the lowest salinity.

A．is a good example of increased salinity in freezing sea water
B．is much larger in area than the Arctic oceans
C．has a much lower salinity now than ever
D．has the denser water in its upper parts

A．Typical Oceans and Their Respective Features
B．The Causes of the Changes in Salinity of Ocean Water
C．Different Oceans Have Different Salinity
D．The Precipitation and Evaporation of Oceans