Iron Atoms, Fe, Are Better Reducing Agents Than Copper Ions

Iron atoms, Fe, are better reducing agents than copper ions, Cu²⁺. In which direction do electrons flow when an iron nail is submerged in a solution of Cu²⁺ ions?

A) Electrons cannot flow from the nail to the Cu²⁺ ions because there is no conductor between the two.
B) The electrons flow from the submerged nail to the copper ions in solution.
C) The electrons flow from the positive charge on the nail to the negative charge on the nail.
D) The electrons flow from the copper ions in solution to the submerged nail.