Answer:
B. cold and low salinity
Step-by-step explanation:
The water composition is defined as a large portion of water that has a particular range of salinity and temperature values associated with it. It acquires its temperature and salinity characteristics on the surface and, once it sinks, these characteristics can only be alternated by mixtures with adjacent water bodies.
The composition of water that moves within a deep water stream is of low and cold salinity, since the waters in depth usually have lower values of temperature and concentration of sea salt.