If $x=t^2$,$y=t^3,then\;\large \frac{d^2y}{dx^2}$ is

Question

$$\begin{array}{1 1}(A)\;\frac{3}{2} & (B)\;\frac{3}{4t}\\(C)\;\frac{3}{2t} & (D)\;\frac{3}{t}\end{array}$$