Draw a graph showing the variation of potential energy with the displacement in a stretched spring.

A particle moves under the influence of a force $F=kx$ in one dimension, where $k$ is a positive constant and $x$ is the distance of the particle from the origin. Assuming that the potential energy $U$ of the particle at the origin is zero, the graph of the potential energy $U$ as a function of $x$ will be:

The shape of the potential energy versus displacement graph for an ideal spring-block system is:

What conclusions can you draw from the potential energy displacement graph drawn below for a spring ?

Which one of the graph A, B or C represents the potential energy versus displacement graph for an oscillating spring?