The following are some statements about adsorption of solutes from the solutions. 

a. Increase in the surface area of the adsorbent increases the extent of adsorption. 

b. Increase in temperature increases the extent of adsorption. 

c. The extent of adsorption (x/m) is related to the molar concentration of solution (c) by $x/m=k{c}^{1/n}$

The correct combination is 

Increase in the surface area of the adsorbent increases the extent of adsorption. Example- powdered substances are more effective adsorbents than their crystalline form.

The extent of adsorption increases with an increase in temperature is an incorrect statement because an increase in temperature reduces the interaction between the adsorbate molecules and adsorbent molecules.

According to the Freundlich’s adsorption isotherm,

              $\frac{w}{m}\alpha K{P}^{1/n}$ where $n\ge 1$

The above equation can also be represent in terms of concentration as:

                  $\frac{w}{m}\alpha K{C}^{1/n}$ where $n\ge 1$

Clearly, statement (B) is wrong.

Hence, option (A) is correct.