A monoatomic ideal gas at pressure $P$ and volume $V$ is first adiabatically compressed to volume $\frac{V}{8}$ and then is allowed to expand isothermally back to its original volume. What is the final pressure of the gas?

• A

  $\frac{P}{2}$
• B

  $P$
• Correct answer
  C

  $4 P$
• D

  $2 P$

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