Least resistant mineral to weathering is

Answer: Option B

Olivine is the least resistant mineral to weathering. Weathering is the deterioration of rocks, soils, minerals, etc. it is basically of two types, physical and chemical weathering.
Olivine is a mixed crystal of Mg₂SiO₄ and Fe₂SiO₄, in which the magnesium member is usually dominant. It is the major mineral in the mantle of the earth as these are not deteriorated by weathering.