Which of the following is the graph showing stressstrain variation for elastomers?

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