Respuesta :
Due to the pedalfer by the formation of the acid at the time when atmospheric and volcanic gases mix with water.
What is a pedalfer?
Pedalfer should be comprise of the aluminum and iron oxides. It should be considered as the subdivision of the order of zonal soil that contains the wide range of soils where sesquioxides increase with respect to the silica at the time of forming the soil. Also it should be arise when the area is humid.
Therefore, we can conclude that the option d is correct.
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