Final answer:
Technician B is correct. Conductors allow electric charges to move freely through their atomic structure, while insulators restrict the flow of electric charges.
Step-by-step explanation:
Technician B is correct. Conductors allow electric charges to move freely through their atomic structure, while insulators restrict the flow of electric charges. In a conductor, such as a metal, there is a large number of free electrons that can move easily in response to an electric field. On the other hand, in an insulator, the electrons are tightly bound and cannot move as freely.