Answer:
B that is electron Shifts to a more electronegative atom
Explanation:
Electron loses potential energy when Shifts to a more electronegative atom. In an reduction-oxidation reaction, when an electron comes in proximity of high electronegative atom, it tends to lose some energy in form of potential energy. Electrons have more energy potential when associated with less electronegative atoms (such as C or H) and less energy potential when associated with a more electronegative atom (such as O).
hence the correct answer is B that is electron Shifts to a more electronegative atom