Desalination is the process of removing ocean water.
a. pollution
c. manganese nodules
b. living resources
d. salt

The correct option is: d. salt  

Explanation:

The sea water from the ocean, has high concentration of salts and thus can be called saline water. The salts predominantly present in the sea water is sodium chloride (NaCl).

Desalination refers to process of removal of minerals and salts from the saline water to produce fresh water. This process produces a by-product called brine, which is a highly concentrated solution of salt and water.

Therefore, the process of removal of salt from the saline ocean water is known as Desalination.

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