Assertion $(A)$: The property of adsorption is shown to a greater extent by solids than liquids.
Reason $(R)$: Solids like charcoal and silica can act as good adsorbents.

• A
  $A$ and $R$ are correct and $R$ is the correct explanation for $A$.
• B
  $A$ and $R$ are correct but $R$ is not the correct explanation for $A$.
• C
  $A$ is correct but $R$ is incorrect.
• D
  $A$ is incorrect but $R$ is correct.