Soils of the Tropics Will Greatly Affect Future Food Supplies

Soils of the tropics will greatly affect future food supplies.Which of the following is correct in relation to these soils?

A) Oxisols and Ultisols dominate the semiarid areas.
B) Oxisols and Ultisols are highly leached and low in available nutrients.
C) Mollisols developed on alluvial parent materials are prized as productive rice soils.
D) Alfisols are widespread in the tropics,especially in humid areas.
E) Aridisols are scarce in the tropics,especially in Africa.