Two different types of rubber are found to have the stress-strain curves as shown. Then

The stress-strain graphs for two materials $A$ and $B$ are shown in figure. The graphs are drawn to the same scale. Select the correct statement

The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by line

In the given figure, if the dimensions of the two wires are same but materials are different, then Young's modulus is

The length of wire, when $M_1$ is hung from it, is $I_1$ and is $I_2$ with both $M_1$ and $M_2$ hanging. The natural length of wire is