The correct answer is A. low melting point and high specific resistance.
A fuse is a safety device that is used to protect electrical circuits from damage caused by excessive current. The fuse is a small, metal wire that is designed to melt and break the circuit if the current exceeds a certain level. The material used for the fuse must have a low melting point so that it will melt and break the circuit quickly if the current gets too high. The material must also have a high specific resistance so that it will not allow a large amount of current to flow through it before it melts.
Option B is incorrect because the material used for the fuse must have a high specific resistance, not a low specific resistance. Option C is incorrect because the material used for the fuse must have a low melting point, not a high melting point. Option D is incorrect because the material used for the fuse must have both a low melting point and a high specific resistance.