Greetings!
The answer would be ~ Gold. All metals are good conductors. But some however may be slower than others. Gold is not that great of a conductor, but is the best choice on here.
Hope this helps!
~DL
Explanation:
Given that,
Power drawn by the refrigerator = 20 watt
Power of burning light inside = 20 watt
Room temperature = 27°C
We need to calculate the temperature
Using formula of coefficient of refrigerator


Put the value into the formula






is less than 
Therefore, refrigerator cools its interior below room temperature while the bulb is on.
Hence, This is the required solution.
I think it would be D
They would both move in the same way