A solution of two components containing \(n_{1}\) moles of the \(1^{\text {st }}\) component and \(n_{2}\) moles of the \(2^{\text {nd }}\) 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 \(2^{\text {nd }}\) component, then \(C_{2}\) can be expressed as   

1. A \(C _{2}=\frac{1000 x _{2}}{ M _{1}+ x _{2}\left( M _{2}- M _{1}\right)}\)
2. B \(C _{2}=\frac{ d x _{2}}{ M _{2}+ x _{2}\left( M _{2}- M _{1}\right)}\)
3. C \(C _{2}=\frac{ d x _{1}}{ M _{2}+ x _{2}\left( M _{2}- M _{1}\right)}\)
4. D \(C _{2}=\frac{1000 dx _{2}}{ M _{1}+ x _{2}\left( M _{2}- M _{1}\right)}\)