The correct option is (a) The relative motion between the coils was not compulsory for the current in the primary to be generated
For explanation I would say: The relative motion between the coils was not really necessary for the current in the primary to be generated. In the third experiment, Faraday placed two stationary coils and connected one of them to the galvanometer and the other to a battery, through a push button. As the button was pressed, the galvanometer in the other coil showed a deflection, indicating the presence of current in that coil. All the other statements are not valid.