Which of the Following Statements Is True

Which of the following statements is true?

A) The temperate deciduous forest is composed of a high diversity of deciduous trees that lose their leaves in the fall because of low soil fertility.
B) Agriculture is often not very successful in a tropical forest because of the poor soils.
C) The high species diversity of a tropical rain forest is supported by a high diversity of soil organisms, high soil fertility, and high rainfall.
D) Agriculture is often not very successful in grasslands because of the poor soils.