The load versus strain graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line
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If $\mathrm{F}, \mathrm{L}, \mathrm{Y}$ are constant then $\ell \propto(1 / \mathrm{A})$
i.e. $\ell \propto\left(1 / r^{2}\right)$
i.e. for same load, thickest wire (radius is more) will show minimum elongation.
From the graph, minimum elongation is shown by graph $OD.$
Hence OD must be thickness wire's graph.
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