A fuse protects an electric circuit from:

overloading

The correct answer is option 3. overloading.

A fuse protects an electric circuit from Overloading.

A fuse is a safety device used in electric circuits to protect against overcurrents. When the current flowing through a circuit exceeds the rated value, the fuse wire inside the fuse melts due to the heat generated by the excessive current. This action breaks the circuit and disconnects the power supply, preventing further damage to the circuit components and minimizing the risk of electrical fires or hazards.

Therefore, a fuse is specifically designed to protect an electric circuit from overloading by interrupting the flow of current when it exceeds a safe limit.