What Similarities Are There in the Motion of Electrons About

Multiple Choice

What similarities are there in the motion of electrons about an atom and electrons being conducted in a superconducting ceramic?

A) The electrons move in circular orbits.
B) Two electrons move in opposite directions but with the same path.
C) The electrons move without loss of kinetic energy.
D) The electrons move in all directions at once, as light does.
E) The electrons move in Cooper pairs.