What is the best explanation of electric current in a wire? Electrons build up in the wire and create a charge. Protons are pushed along by electric forces. Electrons flow because of electrical attraction and repulsion. Atoms move because of heat.

Electrons flow because of electrical attraction and repulsion.

Explanation:

-Electrons build up in the wire and create a charge. This is false, electrons do not "build up" like water would in a pipe.

-Protons are pushed along by electric forces. This is false, protons do not generate elecricity.

-Electrons flow because of electrical attraction and repulsion. This is true. Electrons flow by attracting and repulsing other electrons.

-Atoms move because of heat. This is partially true, but does not explain how electric current moves in a wire.