If the points $(k,2k),(3k,3k)$ and $(3,1)$ are collinear,then the value of k is ______

Question

$\begin{array}{1 1}(A) \;\large\frac{1}{3} \\(B)\;\large\frac{-1}{3} \\(C)\;\large\frac{2}{3} \\(D)\;\large\frac{-2}{3} \end{array}$