F-x and corresponding U-x graphs are as shown in figures. Three points A,B and C in F-x graph may be corresponding to P, Q and R in the U-x graph. Match the following columns and mark the correct option
from the codes given below.

Column I (A)     A (B)     B (C)    C

Column II (p)    P (q)    Q (r )   R (s)    None

A is the point of stable equilibrium, so potential energy is minimum, i.e. at R. Similarly, point C is the unstable
equilibrium position, where potential energy should be maximum, i.e. at P. At point  B force is negative . Since F = - $\frac{dU}{dx}$ and $\frac{dU}{dx} is negative at Q , point B cannot match with point Q .$
Hence,    $\mathrm{A}\to \mathrm{r},\mathrm{B}\to \mathrm{s},\mathrm{C}\to \mathrm{p}$