Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, $$x$$ is the mass of the gas adsorbed on mass $$m$$ of the adsorbent at pressure P. $$\frac{x}{m}$$ is proportional to:

A

$$p^{\frac{1}{4}}$$

B

$$p$$

C

$$p^2$$

D

$$p^{\frac{1}{2}}$$