Which of the following statements is/are true? Oxidation and reduction

Question

Quizplus · Accepted Answer

Choice A is true because oxidation and reduction are always paired processes, where one species loses electrons (is oxidized) while another gains electrons (is reduced). 
Choice B is not true because some chemical changes may not involve oxidation and reduction (for example, a physical change like boiling water). 
Choice C is true because oxidation involves the loss of electrons, while reduction involves the gain of electrons. 
Choice D is true because the change in oxidation state is the result of either gaining or losing electrons during oxidation or reduction reactions.

Which of the Following Statements Is/are True? Oxidation and Reduction