If the ratio of lengths , radii and Young's modulli of two wires in the figure shown are 2,4, and 1 respectively. Then the corresponding ratio of increase in their length will be

Question

$$\begin {array} {1 1} (a)\;32 \\ (b)\;\frac{3}{16} \\ (c)\;1 \\ (d)\;\frac{3}{64}\end {array}$$