Answer: Option B Hydrometallurgical process:- It involves the use of an aqueous solution for the recovery of metals from their ores or concentrates. Generally used for less reactive metals like Gold, Silver, etc

Leaching:- In leaching, the metallic values in an ore are selectively dissolved using a suitable liquid reagent, then we separate the leach liquor from the residue left behind using processes such as settling, thickening, etc. Finally, we recover metallic values from leach liquor using processes such as precipitation, cementation,ion-exchange, etc.