Concept:The fuse is always connected in the live wire to protect the circuit from overcurrent.
Explanation:In house wiring, the live wire carries electric current from the supply to the appliance.
The fuse is placed in the live wire so that it melts and breaks the circuit if the current becomes too high.
This prevents damage to appliances and reduces the risk of fire.
The neutral wire is coloured blue, and the earth wire is coloured yellow and green.
The live wire is identified by its brown colour.
Therefore, the fuse must be connected to the brown wire.
Answer:B. brown