Concept:A fuse protects an electric circuit by breaking the circuit when too much current flows through it.Explanation:The fuse must be connected to the live wire so that it can cut off the supply of current when a fault occurs.Connecting it to the neutral or earth wire would not protect the appliance from excess current in the live circuit.Therefore, the fuse is always connected on the live side of the electric supply.Answer:C. live side of an electric supply