which most likely has the greatest conductivity?\no a warm plastic rod\no a cool rubber tube\no a cool…

Answer:

D. a warm copper wire

Explanation:

Step1: Understand conductivity basics

Conductivity is higher in metals.

Step2: Analyze materials

Plastic and rubber are insulators, silver and copper are metals.

Step3: Consider temperature effect

For metals, conductivity is high even at warm - temperatures. Copper is a very good conductor and is commonly used in electrical wiring. Silver is also a good conductor but copper is more practical and has high conductivity too. So a warm copper wire is likely to have high conductivity among the given options.