Because the Soviet Regime Converted Most Productive Pastures into Farmland

Because the Soviet regime converted most productive pastures into farmland in the mid-1900s to increase the country's supply of grain, northern Kazakhstan

A) has serious problems with desertification.
B) has a large number of immigrants.
C) had a major drop in its population
D) has the highest population density in the steppe belt.
E) has the lowest population density in the region.