One molecule each of Magnesium Chloride (MgCl₂), Water (H₂O) and Carbon dioxide (CO₂) results if reactants are

• A. MgCO₃ and HCl
• B. MgCO₃ and 2HCl
• C. MgHCO₃ and HCl
• D. MgHCO₃ and 2HCl