The correct answer is (d) silver. Silver is the best conductor of electricity, followed by copper, gold, and aluminum. Silver is also the best conductor of heat, and it is used in many electrical applications, such as in electrical wiring and connectors. Copper is also a good conductor of electricity, and it is used in many electrical applications, such as in electrical wiring and plumbing. Gold is a good conductor of electricity, but it is more expensive than copper and silver. Aluminum is a good conductor of electricity, but it is not as good as copper or silver. It is also more susceptible to corrosion than copper or silver.
Mica is an insulator, which means that it does not conduct electricity. It is used in many electrical applications, such as in insulation for wires and cables.