The correct answer is A. spodsols.
Spodosols are a type of soil that is found in cool, humid climates. They are characterized by a thick, dark A horizon that is rich in organic matter, and a light-colored E horizon that is leached of nutrients. The parent material of spodsols is typically sand or loamy sand.
Alfisols are a type of soil that is found in temperate climates. They are characterized by a thick, dark A horizon that is rich in organic matter, and a B horizon that is rich in clay. The parent material of alfisols is typically loam or clay.
Aridisols are a type of soil that is found in arid climates. They are characterized by a thin, light-colored A horizon that is low in organic matter, and a B horizon that is rich in calcium carbonate. The parent material of aridsols is typically sand or loamy sand.
Ultisols are a type of soil that is found in tropical and subtropical climates. They are characterized by a thick, dark A horizon that is rich in organic matter, and a B horizon that is rich in iron and aluminum oxides. The parent material of ultisols is typically loam or clay.
In conclusion, the soils whose parent material tend to be rich in sand are spodsols.