Which statement best describes salinization? 

A)  It results from applying fertilizer to the soil on an annual basis. 
B)  It improves crop growth. 
C)  It results from repeated applications of irrigation water to the soil. 
D)  It increases crop yields.

Salinization occurs when irrigation water contains dissolved salts that accumulate in the soil over time, leading to reduced soil fertility and decreased crop yields. It is a result of repeated applications of irrigation water to the soil. It is not a desirable outcome and can have negative impacts on agricultural productivity and the environment.