The potential energy U between two molecules as a function of distance r between them has been shown.The two molecules are

Question

$\begin{array}{1 1}(A)\;\text{Attract in the region AB and repel in BC}\\(B)\;\text{Attract in the region BC and repel in AB}\\(C)\;\text{Attract in the region AC}\\(D)\;\text{Repel in the region AC}\end{array}$