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

$\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} $

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The two molecules attract when distance between them is greater than $r_0$ and repel when less than $r_0$.At $r=r_0$,force is zero.
Hence (B) is the correct answer.
answered May 8, 2014 by sreemathi.v

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