A metal which is a poor conductor of electricity is

Zinc is a d-block element, which means that the metal is held together electrostatically by free valence electrons, allowing positively charged metal nuclei to move with respect to each other without disrupting the bonding electrons. It conducts electricity as a result.

Aluminum is classified as a p-block element. When we look at its electrical arrangement, we can see that its valence shell comprises unpaired electrons. As a result, it conducts electricity.

Even though it does not conduct electricity, tungsten is a metal. It's an unusual situation, yet it can conduct electricity at high temperatures.

Iron is a metal with metallic connections, which allow electrons to freely flow across multiple atoms.

Hence, option C is correct, i.e., Tungsten.