Explanation:

- Option 4: Silver

- Silver has the highest thermal conductivity of any element.

- It also has the highest light reflectance of all metals.

- Silver is often used in high-end mirrors for its reflectance.

- Correct Answer

- Option 1: Aluminium

- Aluminium is known for its excellent thermal conductivity.

- It does not surpass silver in conductivity or reflectance.

- Option 2: Copper

- Copper is second only to silver in thermal conductivity.

- Its light reflectance is not the highest.

- Option 3: Brass

- Brass is an alloy of copper and zinc.

- It has lower thermal conductivity and reflectance than silver.