The resistance of a discharge tube is

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(B) discharge tube does not follow Ohm's law,which states that the current is directly proportional to the potential difference for a constant resista

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Non-ohmic

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(B) discharge tube does not follow Ohm's law,which states that the current is directly proportional to the potential difference for a constant resistance. In a discharge tube,the current-voltage $(I-V)$ relationship is non-linear due to the process of secondary ionization of the gas particles inside the tube. As the potential difference increases,the number of charge carriers increases significantly,causing the resistance to change. Therefore,it is classified as a non-ohmic device.

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