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 overloading. The wire is made of a material that has a high resistance and a low melting point. When there is an overload in the circuit, the fuse wire will heat up and melt, breaking the circuit and preventing damage to the equipment.
Option B is incorrect because a fuse wire needs to have a high resistance in order to melt when there is an overload in the circuit. Option C is incorrect because a fuse wire needs to have a low melting point in order to melt when there is an overload in the circuit. Option D is incorrect because a fuse wire needs to have a high resistance and a low melting point.