During Podzolization which are accumulated in Bhorizon?

Answer: Option D

Podolization is a complex soil formation process by which dissolved organic matter and ions of iron and aluminiun, released through weathering of various minerals, form organo-mineral complexes and are moved from the upper part of the soil profile and deposit in the deeper parts of the soil.
During Podolization, R₂O₃, CaCO₃ and Humus are accumulated in the B horizon. This generally occurs in areas where precipitation is greater than evapotranspiration.