Which of the following processes will increase salinity of ocean waters

A．sea water is less salty because fresh water joins in
B．rivers carry industrial exhaust into sea
C．sea ice tend to melt more quickly than in the center of oceans
D．heavy water sinks to the deeper portions of the oceans

A．the developing countries which used to be colonies
B．the former British colonies which now are developing
C．the colonized countries which become as strong as Britain
D．the developing countries which are still colonized by Britain