A material of such low conductivity that it does not easily allow current to pass.

• A. Insulators
• B. Conductors
• C. Semiconductors
• D. Wires

Answer: (A)

A material described as not easily passing current is an insulator. This happens because its electrons are tightly bound and not free to move, giving the material a very high resistance and very low conductivity. Insulators resist the flow of electricity, which is why rubber, glass, and dry wood are used to keep currents contained and to protect people from shocks. In contrast, conductors like copper or aluminum have many free electrons that move readily, while semiconductors sit in between and can act as conductors or insulators under different conditions. The description fits insulators best.