Which of the Following Is a True Statement About Chemical

Which of the following is a true statement about chemical constraints in different agroecological areas of the tropics?

A) Aluminum toxicity is most widespread in semiarid areas.
B) Highest phosphorus fixation occurs in semiarid areas.
C) The proportion of saline soils in the humid tropics is greater than in other regions.
D) Low CEC is most prevalent in acid savannas.
E) Acidity without Al toxicity is highest in the humid tropics.