5.6 litre of helium gas at STP is adiabatically compressed to 0.7 litre. If the initial temperature of the gas is T K, work done in the process is ($\mathrm{R}$ is universal gas constant in SI units)

• A

  $\frac{9}{8} \mathrm{RT}$
• Correct answer
  B

  $-\left(\frac{9}{8} \mathrm{RT}\right)$
• C

  $-\left(\frac{4}{3} \mathrm{RT}\right)$
• D

  $\frac{3}{4} \mathrm{RT}$

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