Why is there a reduction reaction every time there is an oxi

Why is there a reduction reaction every time there is an oxidation reaction?

Question 5 options:

A:because entropy is always increasing

B:to maintain heat gradients in cells

C:every time an electron is lost by an atom, it is gained by another atom

D:because energy levels of electrons must always remain full

Solution

C:every time an electron is lost by an atom, it is gained by another atom

Generally Oxidation and reduction reactions are called Redox reactions since they are always coupled. As one species loses electrons (oxidized) the other gains electrons (reduced)