Which of the Following Best Describes Soil

Multiple Choice

Which of the following best describes soil?

A) Soil is composed of solely mineral fragments less than 2 mm in size.
B) Soil lacks biological material,constituting only the inorganic portions of earthen materials.
C) Soil is an inorganic substance,yet vital to sustaining life,particularly plants.
D) Soil is a dynamic material composed of water,air,mineral fragments,and organic matter.
E) Soil is a closed system in terms of matter (water,rock,and sediments) ,but open in terms of energy (insolation) .