Explanation:

- Constantan is known for its high resistance to temperature change.

- It is used especially in thermocouples and resistance wire.

- Option 3: Nickel

- Constantan is an alloy of copper and nickel.

- Offers consistent resistivity across temperature changes, making it ideal for precise measurements.

- Option 1: Aluminium

- Copper alloys with aluminum form other types like aluminum bronze, not constantan.

- Option 2: Tin

- Copper and tin form bronze, another type of alloy different from constantan.

- Option 4: Iron

- Copper and iron do not form constantan; their combination is not typically used for this purpose.