Step 1: Approach:
Rank by resistivity instead. A material with higher resistivity has lower conductivity, since conductivity is the inverse of resistivity.
Step 2: Typical resistivity values:
Rubber is around \(10^{13}\) ohm metre or more. Carbon is around \(10^{-5}\) ohm metre. Iron is about \(10^{-7}\) ohm metre. Copper is about \(1.7\times10^{-8}\) ohm metre.
Step 3: Reverse the ranking:
Highest resistivity is rubber, then carbon, then iron, then copper. So the conductivity rises in the order rubber, carbon, iron, copper.
Step 4: Match with the options:
In letters this is A, C, B, D. That is the third printed option. The rest of the options break this order.
Final Answer:
Ranking by resistivity gives A, C, B, D, so option 3.
\[ \boxed{\text{Option 3}} \]