On walking x meters towards a chiming in a horizontal line through its base, the elevation of its top changes from $30^{\circ}$ to $60^{\circ}$ . The height of the chimney is _________

Question

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