Explanation: A liquid capable of conducting electricity while undergoing decomposition is precisely the definition of an electrolyte. Electrolytes contain ions that move to carry electric current. During this process, chemical reactions occur at the electrodes, often leading to the decomposition of the electrolyte itself or the deposition of material (a process known as electrolysis). This fundamental principle is crucial in understanding batteries and electrochemistry. Option B describes a property of certain solid materials related to magnetism, not a conductive liquid that decomposes. Option C refers to a circuit's electrical resistance, which is a quantitative measurement, not a type of liquid. Therefore, neither B nor C fits the description.