Identify elements present in copper pyrites.

• A

  $\mathrm{Cu}, \mathrm{K}, \mathrm{S}$
• B

  $\mathrm{Mg}, \mathrm{Cu}, \mathrm{P}$
• C

  $\mathrm{Ca}, \mathrm{S}, \mathrm{O}$
• Correct answer
  D

  $\mathrm{Fe}, \mathrm{Cu}, \mathrm{S}$

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