Which of the Following Is Correct About the U

Multiple Choice

Which of the following is correct about the U.S. soil classification system?

A) Soil variation is too complex for a single classification system, so many regional classification systems are used within the U.S.
B) The Soil Taxonomy is hierarchical, consisting of six categories from soil series to soil order.
C) The soil classification system was finalized in 1975 and no additional changes to it will be made.
D) It is primarily based on pedogenic regimes in which each soil-forming process is attached to a climatic region.