In the Hypothetical Atomic Interaction Shown in Figure C9 $r=0.2 \mathrm{~nm}$

In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have zero velocity at a separation of $r=0.2 \mathrm{~nm}$ . How will their separation subsequently evolve with time?

A) It will remain fixed at $r=0.2 \mathrm{~nm}$ .
B) It will oscillate between $r=0.2 \mathrm{~nm}$ and $\boldsymbol{r}=\mathbf{0 . 0 6 \mathrm { nm }}$ .
C) It will decrease to about $r=0.06 \mathrm{~nm}$ , rebound, and then increase to essentially infinite separation.
D) It will increase to essentially infinite separation.
E) Some other behavior (specify) .