Density of the ocean water is
a. generally very low
b. not affected by salinity
c. not affected by temperature
d. greater than the density of freshwater

D. Greater than the density of freshwater.

Explanation:

Ocean water has a lot of salt and other such, the majority of it anyways. This already gives the advantage, as freshwater doesn't have all these additions. The salt and other such within the ocean water gives the ocean more density, or mass. Density is, in a way, another word for mass.

D. Greater than the density of freshwater

Explanation:

Salt has a greater density than water, and ocean water has more salt than fresh.

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where are the vectors ?