The correct answer is D. A copper wire of length 1 m and diameter 3 mm.
A voltmeter is a device used to measure the voltage between two points in an electric circuit. It has a high resistance, so that very little current flows through it when it is connected to a circuit. A moving coil galvanometer is a device used to measure small currents. It has a low resistance, so that a large current flows through it when it is connected to a circuit. An ammeter is a device used to measure large currents. It has a very low resistance, so that a very large current flows through it when it is connected to a circuit. A copper wire of length 1 m and diameter 3 mm has a resistance of 0.016 ohms. This is because the resistance of a wire is proportional to its length and inversely proportional to its cross-sectional area. The longer the wire, the greater the resistance. The larger the cross-sectional area, the smaller the resistance.
Therefore, the copper wire of length 1 m and diameter 3 mm is likely to have the largest resistance.