Which of the following is the smallest fraction $\frac{3}{5} \; \frac{1}{2} \; \frac{2}{3} \;\frac{4}{7} \; \frac{3}{8}$

Question

$\begin{array}{11} (a)\; \frac{2}{3} \\ (b)\; \frac{1}{2} \\ (c)\; \frac{4}{7} \\ (d)\; \frac{3}{8} \end{array}$