The correct answer to your question is C- Negative Ion.
By soil parent material type is understoodunconsolidated deposits (regolith) found on the bedrock. Most Soil parent materials are made up from weathered and disintegrated rock material.
Normally a granite, when metamorphosed, would first form a schist, and then a gneiss would be the higher stage of metamorphism. Presumably in this case, the pressure and temperature conditions were high enough to skip the schist step.
