The force required to stretch a spring var

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The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with the above spring of half length, the line $OA$ will

A

Shift towards $F-$axis

B

Shift towards $X-$axis

C

Remain as it is

D

Become double in length

The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with the above spring of half length, the line $OA$ will

When the length of spring is halved, its spring constant will becomes double. (because $k \propto \frac{1}{x} \propto \frac{1}{L}\therefore k \propto \frac{1}{L}$)
Slope of force displacement graph gives the spring constant $(k)$ of spring.
If k becomes double then slope of the graph increases i.e. graph shifts towards force-axis.