$A$ solution contains a non-volatile solute of molecular mass $M_p$. Which of the following can be used to calculate the molecular mass of the solute in terms of osmotic pressure ($m = \text{Mass of solute}$,$V = \text{Volume of solution}$,and $\pi = \text{Osmotic pressure}$)?

• A
  $M_p = (\frac{m}{\pi}) VRT$
• B
  $M_p = (\frac{m}{V}) \frac{RT}{\pi}$
• C
  $M_p = (\frac{m}{V}) \frac{\pi}{RT}$
• D
  $M_p = (\frac{m}{V}) \pi RT$