Geeta finishes ahead of Shalini i.e. $Shalini \rightarrow Geeta$ ....$(i)$
Vaani finishes after Aparna i.e $Vaani \rightarrow Aparna$ .............$(ii)$
Divya finishes ahead of Aparna i.e. $Aparna \rightarrow Divya$.......$(iii)$
from $(ii)$ and $(iii)$
$Vaani \rightarrow Aparna \rightarrow Divya$ .
So the winner can be either $Geeta$ or $Divya$
In option $C$ it is given Geeta finishes ahead of Divya i.e. $Divya \rightarrow Geeta$
So Geeta will be the winner.
Hence option $C$ is correct.
We will not use option $A$ as it is mentioned that we need to take minimal set of information to determine the winner.