Question

The largest use of the world's water is _____.

Answer 1

Water is to serve the needs of every human in the world! Therefore, it's for drinking!! Hope this helped (:

Answer 2

Recreational for drinking agricultural for sanitation.

So I would say it is C. 
 
 The largest use of the world's water is used for irrigation or agriculture.
This is because the high demand of food thus agricultural products are demanded to supply at a rapid amount in just a short time. The population growth influences mainly the use of resources and one is water. Fresh water only amounts little to the drastic needs of society today and much is used for agriculture as studies suggest.