Answer: Option (b) is the correct answer.
Step-by-step explanation:
It is known that metals are good conductors of heat and electricity due to the presence of mobile electrons.
As flow of electrons is necessary for conduction of heat and electricity.
Also, out of all the metals silver and copper are the best metals for conduction of heat and electricity.
Thus, out of the given options we can conclude that copper (Cu) is the best metal to use in an alloy to increase its electrical conductivity.