What Do Recent Compilations of Soil Data from Around the World

What do recent compilations of soil data from around the world show?

A) That soil erosion under conventional agriculture exceeds both the rates of soil production and geological erosion rates by several orders of magnitude.
B) That soil erosion,once a problem for all,is now under control in many countries.
C) That soil erosion is greatest in arid countries where there are annual water deficits.
D) That the southern hemisphere has learned to manage soil erosion,while in the northern hemisphere it is still a major problem.