Wiring requires copper or what?
LEDs energy H20 fibers SO2 motors gold tube
A B C D E F G H
Most electrical conductors, such as wires, are made of copper or gold.
Wiring requires copper or gold. 
Wiring requires copper or what? (A) LEDs (B) energy (C) H20 (D) fibers (E) SO2 (F) motors (G) gold (H) tube