Select the Correct Description of Salinization

Select the correct description of salinization.

A) Intensive irrigation moves mineral salts down to deeper soil layers, potentially beneath the reach of plant roots.
B) As water vapor evaporates from soil, mineral salts are drawn upward and accumulate in the topsoil, eventually building up to amounts damaging or lethal to plants.
C) Drought, extreme erosion, and soil infertility cause land to lose more than 10% of its productivity.
D) As an aquifer dries up, the land on top settles as formerly water-filled spaces collapse under the weight of overlying rock and soil.