Question

which element is most likely to allow electricity to pass through it?
copper
carbon
helium
sulfur

Explanation:

Electrical conductivity in elements depends on the presence of free, mobile charge carriers. Copper is a metal with a sea of delocalized electrons that can easily carry electric current. Carbon (in most forms like graphite is conductive but not as strongly as copper; diamond is an insulator), helium is a noble gas with no free charge carriers, and sulfur is a nonmetal with no mobile electrons for conduction.

Answer:

copper