The potential energy `U` between two molecules as a function of the distance `X` between them has been shown in the figure. The two moleucles are
A. attracted when `X` lies between `A` and `B` and are replled when `X` lies between `B` and `C`
B. attracted when `X` lies between `B` and `C` and are repelled when `X` lies between `A` and `B`
C. attracted when they reach `B`
D. repelled when they reach `B`
