Which one of the following characteristics is associated with adsorption?

• A
  $\Delta G$ and $\Delta H$ are negative but $\Delta S$ is positive.
• B
  $\Delta G$ and $\Delta S$ are negative but $\Delta H$ is positive.
• C
  $\Delta G$ is negative but $\Delta H$ and $\Delta S$ are positive.
• D
  $\Delta G, \Delta H$ and $\Delta S$ all are negative.