If $x$ is amount of adsorbate and $m$ is amount of adsorbent, which of the following relations is not related to adsorption process?

• A

  $\frac{x}{m}=f(T)$ at constant $p$
• B

  $p=f(T)$ at constant $\left(\frac{x}{m}\right)$
• Correct answer
  C

  $\frac{x}{m}=p \times T$
• D

  $\frac{x}{m}=f(p)$ at constant $T$

Hence, the correct answer is option: 'C'.