$A$ solution of two components containing $n_{1}$ moles of the $1^{st}$ component and $n_{2}$ moles of the $2^{nd}$ component is prepared. $M_{1}$ and $M_{2}$ are the molecular weights of component $1$ and $2$ respectively. If $d$ is the density of the solution in $g \ mL^{-1}$, $C_{2}$ is the molarity and $x_{2}$ is the mole fraction of the $2^{nd}$ component, then $C_{2}$ can be expressed as

• A
  $C_{2} = \frac{1000 x_{2}}{M_{1} + x_{2}(M_{2} - M_{1})}$
• B
  $C_{2} = \frac{d x_{2}}{M_{2} + x_{2}(M_{2} - M_{1})}$
• C
  $C_{2} = \frac{d x_{1}}{M_{2} + x_{2}(M_{2} - M_{1})}$
• D
  $C_{2} = \frac{1000 d x_{2}}{M_{1} + x_{2}(M_{2} - M_{1})}$