Which soil horizon contains unaltered to partially-altered parent materials?HintsWhich soil horizon contains unaltered to partially-altered parent materials?B horizonC horizonA horizonE horizonO horizonHow might differential stress act as an agent of metamorphism to create a metamorphic rock?a Differential stresses trigger chemical reactions that recrystallize old minerals as well as create new ones.b Differential stresses release chemical fluids that enable ion migration, which can generate new crystals.Even pressure on all sides will create a more compact, more dense rock.c Differential stresses melt old minerals, which solidify into new rocks.d Unequal pressures will deform a rock created of layers of flattened mineral grains.