If $4x^2=y^3$, what is the following equivalent to in terms of: $y$ <br><br>$\qquad \qquad \qquad \large\frac{x}{\sqrt y}$

Question

$\begin{array}{1 1} (a)\; \pm \large\frac{1}{8} \normalsize y^{3/2}\\ (b)\;\large\frac{1}{4} \normalsize y^2 \\ (c)\;\pm \large\frac{1}{2} \normalsize y \\ (d) \;2y \end{array} $