I believe it is either A or B
Answer=1
Potassium Sulfide= K2S (two metals, one non metal)
Sodium Oxide=Na2O (two metals. one nonmetal)
Sodium Chloride=NaCl (one metal, one nonmetal)
Magnesium Oxide=MgO (one metal, one nonmetal)
Magnesium Chloride=MgCl2 (one metal, two nonmetals)
<span>ZnCO3 is an inorganic compound and it contains two parts; one is cation(positive part of compound) whereas other is anion(negative part of compound). Here, </span>

<span> is cation and </span>

is anion. Hope this helps.