If a substance $A$ dissolves in a solution of a mixture of $B$ and $C$ with their respective number of moles as $n_A, n_B$ and $n_C$,the mole fraction of $C$ in the solution is:
- A$\frac{n_C}{n_A \times n_B \times n_C}$
- B$\frac{n_C}{n_A + n_B + n_C}$
- C$\frac{n_C}{n_A - n_B - n_C}$
- D$\frac{n_B}{n_A + n_B}$
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