Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at $$25^\circ C$$. For this process, the correct statement is

A

The adsorption requires activation at $$25^\circ C$$.

B

The adsorption is accompanied by a decreasein enthalpy.

C

The adsorption increases with increase of temperature.

D

The adsorptionis irreversible.