The correct option is A lower reduction potential to higher reduction potential
The gain of electrons by a molecule or the addition of electrons to a molecule is referred to as reduction.
The loss of electrons by a molecule or the removal of electrons from a molecule is referred to as oxidation.
Reduction potential refers to the tendency of a molecule to gain or accept electrons.
A molecule with high reduction potential tends to gain electrons while a molecule with lower reduction potential tends to lose electrons.
So, the transfer of electrons can occur from a molecule with lower reduction potential to a molecule with higher reduction potential.