During the adsorption of krypton on activated charcoal at low temperature,which of the following thermodynamic conditions is true?

• A
  $\Delta H < 0$ and $\Delta S < 0$
• B
  $\Delta H > 0$ and $\Delta S < 0$
• C
  $\Delta H > 0$ and $\Delta S > 0$
• D
  $\Delta H < 0$ and $\Delta S > 0$