ANS:A - Steel

Among the options provided, steel typically has the highest thermal conductivity at the same temperature. Explanation:

• Thermal conductivity is a measure of a material's ability to conduct heat. It quantifies how efficiently heat is transferred through a material.
• Steel is known for its relatively high thermal conductivity compared to other common materials like petrol and air.
• Petrol and air have much lower thermal conductivities compared to steel.
• While the specific thermal conductivity values can vary depending on factors such as temperature and material composition, steel generally exhibits significantly higher thermal conductivity than petrol and air.