In electrolysis the flow of electrons occurs from Anode (Positively Charged electrode) towards Cathode (Negatively charged electrode).
Therefore Diagram A shows the correct flow of electron in an electrolysis
What is electrolysis ?
Chemical decomposition produced by passing an electric current through a Electrolytic (Salt) solution containing ions.
Anode is located at the left hand side of the electrolytic cell where as cathode is located at the right hand side of the electrolytic cell.
Therefore, In the given diagrams, Diagram A follows the above mentioned pattern.
Hence, It shows the correct direction of electron flow in an electrolytic cell.
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