Question

which most likely has the greatest conductivity?
a warm plastic rod
a cool rubber tube
a cool silver strip
a warm copper wire

Explanation:

Plastic and rubber are insulators with low conductivity. Silver and copper are metals, and silver is one of the best conductors. Generally, conductivity of metals decreases with temperature increase, so a cool silver strip is likely to have higher conductivity than a warm copper wire.

Answer:

C. a cool silver strip