The correct answer is A. High resistance and low melting point.
A fuse wire is a thin wire that is used to protect electrical circuits from damage caused by an overload of current. The fuse wire is designed to melt and break the circuit if the current exceeds a certain value. This prevents the circuit from overheating and causing a fire.
The fuse wire must have a high resistance so that it will heat up and melt quickly when there is an overload of current. The fuse wire must also have a low melting point so that it will melt easily.
If the fuse wire had a low resistance, it would not heat up enough to melt when there was an overload of current. This would allow the current to continue flowing through the circuit, which could cause damage.
If the fuse wire had a high melting point, it would not melt easily when there was an overload of current. This would also allow the current to continue flowing through the circuit, which could cause damage.
Therefore, the fuse wire must have a high resistance and a low melting point in order to protect the electrical circuit from damage.