Kaolinite, a form of clay is the ore of metal $x$ and malachite is the ore of metal $y$. $x$ and $y$ respectively are

• A

  $\mathrm{Cu}, \mathrm{Zn}$
• B

  $\mathrm{K}, \mathrm{Cu}$
• Correct answer
  C

  $\mathrm{Al}, \mathrm{Cu}$
• D

  $\mathrm{Zn}, \mathrm{Al}$

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