Given the following parallel reactions, where $\large\frac{k_1}{k_2}=\frac{1}{3}$. Initially only 4 moles of A are present. The total number of moles of C at the end of 50% reaction is:

Question

$\begin{array}{1 1} 2 \\ 1 \\ 1.5 \\ 0.666 \end{array}$