Given below are two statement : one is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.
Assertion $\mathrm{A}:{\mathrm{SO}}_2( \mathrm{g})$ is adsorbed to a large extent than ${\mathrm{H}}_2( \mathrm{g})$ on activated charcoal.

Reason $\mathrm{R}$ : ${\mathrm{SO}}_2( \mathrm{g})$ has a higher critical temperature than ${\mathrm{H}}_2( \mathrm{g})$

In the light of the above statements, choose the most appropriate answer from the options given below.

• A

  Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the
  correct explanation fo $\mathrm{A}$
• Correct answer
  B

  Both $\mathrm{A}$ and $\mathrm{R}$ are correct and $\mathrm{R}$ is the correct
  explanation of $\mathrm{A}$.
• C

  $\mathrm{A}$ is not correct but $\mathrm{R}$ is correct.
• D

  $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct.

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