Answer :

As the electric field is in +X direction, that is field lines will flow from point C to point A. And as we already know that field lines flow from high potential to low potential, that means point A needs to be at a low potential region and point C needs to be at a high potential region.

Points B and D are equipotential.

The order of potentials is:

VC > VB =VD > VA

Therefore, potential is minimum at A.

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