उत्तर : 3. "Silver"
व्याख्या :

Answer: C) Silver Explanation: silver is the best conductor of electricity. When compared to remaining 3 metals, as Silver having more number of free electrons in its valency shell it is the good conductor of electricity. Conductors Thermal Conductivity @ 25degree C Silver --- 429Copper --- 401Gold --- 310Aluminium --- 250