Which condition causes ocean salinity to increase?

a.
river water flowing out into the ocean

b.
high levels of precipitation

c.
high levels of evaporation

d.
thawing of polar ice caps

the condition that causes ocean salinity to increase is : c. high levels of evaporation salinity refers to the concentration fo the salt in the ocean. When water evaporates, the concentration of the salt became thicker , becasue now there is less water to contain the same amount of salt