The extent of adsorbtion of adsorbate on adsorbent from solution phase increases with:
decrease in surface area of the adsorbent
Increase in surface area of adsorbent
Increase in temperature of solution
Decrease in amount of adsorbate in solution
Factor affecting adsorption -
The extent of adsorption increases with the increase of surface area per unit mass of the adsorbent at a given temperature and pressure.
More adsorbate more adsorption, large area large adsorption.
Therefore, option number (2) is correct.