Malachite decomposed to give $A+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$ and compound $A$ on reduction with carbon gives $C O+B$. Here, $A$ and $B$ are

• A

  $\mathrm{CuO}, \mathrm{Cu}$
• B

  $\mathrm{Cu}_2 \mathrm{O}, \mathrm{CuO}$
• Correct answer
  C

  $\mathrm{Cu}_2 \mathrm{O}, \mathrm{Cu}$
• D

  $\mathrm{CuCO}_3, \mathrm{Cu}$

Hence, the correct answer is option: 'C'.