The most suitable answer is C becuase they would gain two elctrons to atain that stable OCTET thus becoming a anion with a charge of -2 and by virtue oxidation states of -2. There is however an exception with oxygen in two cases. But I still remain that the best answer would be C
Some properties to differentiate between the minerals include:
Ductility
Malleability
Luster
Particle Size
Ability to react with chemicals
etc....
I think unbalanced? not sure sorry
Copper chloride ...............
