Fresh water is used for which of the following?

A-Growing food

B-drinking

C-All of above

D-Cooking

B. We drink fresh water, we cannot drink Salt Water and survive.

Some food, such as kelp/seaweed/nori grows in salt water. And some food is cooked in Salt/Ocean water.

... but fresh water is used in all of the above, as well ... so ... the question, as posted, is open to your interpretation.

the correct option is c ... because if you dont drink fresh water you coud die