What is a characteristic of conductors in terms of electron movement?

Conductors are materials that allow electrons to move freely through them. This property is primarily due to the presence of delocalized electrons, which are not bound to any specific atom and can move throughout the material. In metals, for instance, these free electrons can drift in response to an electric field, enabling the conduction of electricity.

This ease of electron movement is what differentiates conductors from insulators, which restrict electron flow. The other options suggest that conductors either impede or block electron movement entirely, which is not the case. Conductors are specifically defined by their ability to facilitate the flow of electrons, making option B the only accurate description of their behavior in terms of electron movement.